# Celsius vs. Fahrenheit scale- 10 Differences with Examples

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Temperature is one of the most common physical quantities that we encounter in our daily lives. It measures how hot or cold an object or a substance is. There are different ways of measuring temperature using different units and scales. Two of the most widely used temperature scales are the Celsius scale and the Fahrenheit scale. These scales have different origins, definitions, and applications, but they can be converted from one to another using simple formulas. In this article, we will explore the differences between these two scales and see some examples of how they are used in various contexts.

The Celsius scale is a temperature scale that uses the symbol °C and is based on the triple point of water and the concept of absolute zero. The triple point of water is the temperature and pressure at which water can exist in three states: solid, liquid, and gas. The absolute zero is the lowest possible temperature, where all molecular motion stops.

The Celsius scale was introduced by and named after the Swedish astronomer Anders Celsius in 1742. He originally proposed a scale that had 0°C as the boiling point of water and 100°C as the freezing point of ice, but this was later inverted to match the modern definition.

The modern definition of the Celsius scale was adopted in 1954 by the International Bureau of Weights and Measures (BIPM). It defines the triple point of water as exactly 273.16 K or 0.01 °C, and the absolute zero as exactly 0 K or -273.15 °C. This means that one degree Celsius is equal to one kelvin, which is the SI unit of temperature.

The Celsius scale is widely used in most countries that follow the metric system, as well as for scientific purposes. It is easy to relate to everyday phenomena, such as the freezing and boiling points of water, which are 0°C and 100°C respectively. The average human body temperature is also about 37°C on this scale.

Fahrenheit scale is a temperature scale that is based on the freezing point of water at 32°F and the boiling point of water at 212°F. The scale was introduced by and also named after the physicist Daniel Gabriel Fahrenheit in 1720 A.D. This scale uses the symbol °F.

The lowest defining point in the Fahrenheit scale is the temperature of a solution of brine with an equal amount of ice, water, and salt (ammonium chloride). The temperature of the average human body was first established at 96°F, which was later adjusted to 98.6°F.

In this scale, the lower fixed point is considered 32°F, and the upper fixed point is considered 212°F. The region between these two temperatures is divided into 180 equal parts so that each part equals to one Fahrenheit degree (1°F). Thus, the freezing point of water is 32°F, and the boiling point of water is 212°F on the Fahrenheit scale.

The formula for the conversion of degree Fahrenheit to degree Celsius is given by:

$$°C = (°F – 32) × \frac{5}{9}$$

The absolute zero value in the Fahrenheit scale is -459.67° F.

Fahrenheit scale is the first standardized temperature scale to be used in the world. It was prevalent in most English-speaking nations until the 1960s. The Celsius scale then replaced this scale after 1960 in most countries except the United States.

Celsius and Fahrenheit scales are two different ways of measuring temperature. They have different origins, definitions, divisions, and usage. Here are some of the main differences between them:

- The Celsius scale is based on the triple point of water, which is the temperature at which water can exist in solid, liquid, and gas states at the same time. The Fahrenheit scale is based on the freezing and boiling points of water at normal atmospheric pressure.
- The Celsius scale has 0°C as the freezing point of water and 100°C as the boiling point of water. The Fahrenheit scale has 32°F as the freezing point of water and 212°F as the boiling point of water.
- The Celsius scale has 100 equal divisions between the freezing and boiling points of water, each called a degree Celsius (°C). The Fahrenheit scale has 180 equal divisions between the freezing and boiling points of water, each called a degree Fahrenheit (°F).
- The Celsius scale is more widely used in the world, especially in countries that follow the metric system. The Fahrenheit scale is mainly used in the United States and some other countries that follow the imperial system.
- The Celsius scale is more convenient for scientific purposes, as it is easier to convert to other temperature scales such as Kelvin and Rankine. The Fahrenheit scale is more convenient for everyday purposes, as it has a wider range of temperatures that are comfortable for humans.
- The average human body temperature is about 37°C on the Celsius scale and about 98.6°F on the Fahrenheit scale. However, these values may vary depending on various factors such as age, health, activity level, etc.
- The absolute zero value, which is the lowest possible temperature that can be reached, is -273.15°C on the Celsius scale and -459.67°F on the Fahrenheit scale.

These are some of the main differences between Celsius and Fahrenheit scales. However, they can be easily converted from one to another using simple formulas or online calculators. In the next section, we will learn how to do that.😊

The Celsius and Fahrenheit scales are two different ways of measuring temperature. They have different origins, definitions, divisions, and usage. The following table summarizes some of the main differences between them:

Basis | Celsius | Fahrenheit |
---|---|---|

Origin | Named after Anders Celsius, a Swedish astronomer who proposed the scale in 1742. | Named after Daniel Gabriel Fahrenheit, a German physicist who devised the scale in 1720. |

Definition | Based on the triple point of water (the temperature at which water can exist in solid, liquid, and gas phases) and absolute zero (the lowest possible temperature). The triple point of water is defined as 0.01°C and absolute zero is -273.15°C. | Based on the freezing point of a brine solution (a mixture of ice, water, and salt) and the average human body temperature. The freezing point of brine is defined as 0°F and the average human body temperature is 98.6°F. |

Division | Divides the interval between the triple point of water and absolute zero into 273.16 equal parts, each called one degree Celsius (1°C). | Divides the interval between the freezing point of brine and the average human body temperature into 96 equal parts, each called one degree Fahrenheit (1°F). |

Usage | Widely used in most countries that follow the metric system and for scientific purposes. | Mainly used in the United States and some other countries that follow the imperial system. |

Conversion | To convert from Celsius to Fahrenheit, multiply by 9/5 and add 32. To convert from Fahrenheit to Celsius, subtract 32 and multiply by 5/9. | To convert from Fahrenheit to Celsius, subtract 32 and multiply by 5/9. To convert from Celsius to Fahrenheit, multiply by 9/5 and add 32. |

One of the most noticeable differences between Celsius and Fahrenheit scales is the **freezing and boiling points of water**. These are the temperatures at which water changes its state from solid to liquid or from liquid to gas.

On the **Celsius scale**, the freezing point of water is **0°C** and the boiling point of water is **100°C**. This means that water freezes when it reaches 0°C and boils when it reaches 100°C. The difference between these two points is **100°C**.

On the **Fahrenheit scale**, the freezing point of water is **32°F** and the boiling point of water is **212°F**. This means that water freezes when it reaches 32°F and boils when it reaches 212°F. The difference between these two points is **180°F**.

The following table shows the comparison between the freezing and boiling points of water on both scales:

Celsius | Fahrenheit |
---|---|

0°C | 32°F |

100°C | 212°F |

As you can see, the Fahrenheit scale has a larger range than the Celsius scale for the same change in state of water. This means that the Fahrenheit scale is more sensitive to temperature changes than the Celsius scale.

To convert between Celsius and Fahrenheit temperatures, you can use the following formulas:

- To convert from Celsius to Fahrenheit, multiply by 9, divide by 5, and add 32.
- To convert from Fahrenheit to Celsius, subtract 32, multiply by 5, and divide by 9.

For example, to convert 20°C to Fahrenheit, you would do:

20°C × 9/5 + 32 = 68°F

To convert 68°F to Celsius, you would do:

(68°F - 32) × 5/9 = 20°C

The freezing and boiling points of water are important for many applications, such as cooking, weather forecasting, and scientific experiments. Knowing how to convert between Celsius and Fahrenheit scales can help you understand and compare different temperature measurements.

The average human body temperature is a measure of the internal heat of a person. It is usually measured by a thermometer placed in the mouth, under the armpit, or in the rectum.

The normal range of human body temperature varies slightly among individuals and also depends on factors such as age, time of day, activity level, and health condition.

However, a commonly accepted value for the average human body temperature is **37°C** on the Celsius scale or **98.6°F** on the Fahrenheit scale.

This value was first established by the German physician Carl Reinhold August Wunderlich in 1868 based on millions of measurements from 25,000 patients.

However, some recent studies have suggested that the average human body temperature may have decreased slightly over time due to improved hygiene, nutrition, and medical care.

For example, a study published in 2020 by Stanford University researchers found that the average body temperature of Americans has dropped by about 0.03°C per decade since the 19th century.

According to this study, the average body temperature of Americans in 2020 was about **36.6°C** or **97.9°F**.

Another study published in 2019 by Oxford University researchers found that the average body temperature of British people has also declined by about 0.15°C per century since the 1840s.

According to this study, the average body temperature of British people in 2019 was about **36.4°C** or **97.5°F**.

These findings suggest that the average human body temperature may not be a fixed constant, but rather a dynamic variable that reflects the changing environment and lifestyle of humans.

However, more research is needed to confirm these trends and to understand their implications for health and disease.

Regardless of the exact value of the average human body temperature, it is important to note that it can vary significantly among individuals and even within the same person throughout the day.

A normal body temperature for one person may be slightly higher or lower than another person`s normal temperature.

Similarly, a person`s body temperature may fluctuate by up to 0.5°C or 1°F depending on factors such as circadian rhythm, hormonal changes, physical activity, food intake, and emotional state.

Therefore, it is not advisable to rely solely on a single measurement of body temperature to diagnose a fever or an infection.

Instead, it is better to compare multiple measurements over time and to consider other symptoms and signs of illness.

A fever is generally defined as a body temperature above **38°C** or **100.4°F** on either scale.

A fever is usually a sign of an infection or inflammation in the body and can help fight off harmful germs by stimulating the immune system.

However, a fever can also cause discomfort, dehydration, and sometimes serious complications if it is too high or lasts too long.

Therefore, it is important to seek medical attention if a fever persists for more than three days, exceeds **40°C** or **104°F**, or is accompanied by other severe symptoms such as headache, confusion, seizures, rash, or breathing difficulties.

Absolute zero is the lowest possible temperature that can be attained by any substance. It is the point where all molecular motion ceases and the entropy of a system reaches its minimum value. Absolute zero cannot be reached in practice, but it is a useful theoretical concept for thermodynamics and physics.

The value of absolute zero on the Celsius scale is -273.15°C. This means that no substance can have a temperature lower than -273.15°C on this scale. The Celsius scale is also known as a relative scale, because it is based on the difference between two reference points: the freezing point and the boiling point of water.

The value of absolute zero on the Fahrenheit scale is -459.67°F. This means that no substance can have a temperature lower than -459.67°F on this scale. The Fahrenheit scale is also known as an absolute scale, because it is based on the lowest possible temperature that can be measured.

The relationship between the absolute zero values on both scales can be derived from the conversion formulas between Celsius and Fahrenheit:

°C = (°F – 32) × 5/9

°F = (9/5 × °C) + 32

Substituting °C = -273.15 and °F = -459.67 in these equations, we get:

-273.15 = (-459.67 – 32) × 5/9

-459.67 = (9/5 × -273.15) + 32

These equations show that the absolute zero values on both scales are equivalent and consistent.

The concept of absolute zero was first proposed by Robert Boyle in 1665, who suggested that there might be a lower limit to the temperature of gases. Later, in 1702, Guillaume Amontons observed that the pressure of a gas decreases linearly with its temperature and extrapolated that it would reach zero at a certain point. This point was later named as absolute zero by Lord Kelvin in 1848, who also defined a new temperature scale based on it: the Kelvin scale.

The Kelvin scale is another absolute temperature scale that uses the same size of degree as the Celsius scale, but has its zero point at absolute zero. The symbol for Kelvin is K and it does not use the degree sign (°). The conversion formula between Celsius and Kelvin is:

K = °C + 273.15

The Kelvin scale is widely used in scientific fields such as physics, chemistry, astronomy, and engineering, because it simplifies many calculations and equations involving temperature.

One of the main differences between the Celsius and Fahrenheit scales is the number of divisions or degrees between the freezing and boiling points of water. On the Celsius scale, there are 100 degrees between these two points, while on the Fahrenheit scale, there are 180 degrees. This means that one degree Celsius is equal to 1.8 degrees Fahrenheit, or one degree Fahrenheit is equal to 0.5556 degrees Celsius.

The Celsius scale is based on the decimal system, which makes it easier to use for calculations and conversions. The Fahrenheit scale, on the other hand, is based on a more complex system that involves fractions and multiples of 12. The Fahrenheit scale was originally designed to measure the temperature of substances such as saltwater and mercury, which have different freezing and boiling points than water.

The advantage of the Fahrenheit scale is that it has a finer resolution than the Celsius scale, which means that it can measure smaller changes in temperature more accurately. The disadvantage of the Fahrenheit scale is that it is less intuitive and more difficult to relate to everyday phenomena such as weather and human body temperature.

The advantage of the Celsius scale is that it is more widely used and accepted in most parts of the world, especially in scientific and technical fields. The disadvantage of the Celsius scale is that it has a coarser resolution than the Fahrenheit scale, which means that it can miss some subtle variations in temperature.

Here is a table that shows some common temperatures on both scales:

Temperature | Celsius | Fahrenheit |
---|---|---|

Absolute zero | -273.15°C | -459.67°F |

Freezing point of water | 0°C | 32°F |

Boiling point of water | 100°C | 212°F |

Average human body temperature | 37°C | 98.6°F |

Room temperature | 20°C-25°C | 68°F-77°F |

Hot summer day | 35°C-40°C | 95°F-104°F |

Cold winter day | -10°C-0°C | 14°F-32°F |

The Celsius scale and the Fahrenheit scale are both widely used for measuring temperature, but they have different applications and preferences in different regions of the world.

The Celsius scale is more commonly used in areas that follow the metric system of units, such as most of Europe, Asia, Africa, and Oceania. The Celsius scale is also the standard scale for scientific purposes, as it is easier to work with in calculations and conversions. The Celsius scale is based on the decimal system, which makes it compatible with other metric units such as meters, grams, and liters.

The Fahrenheit scale is more commonly used in areas that follow the imperial or US customary system of units, such as the United States, Canada, and some Caribbean countries. The Fahrenheit scale is also preferred by some people for everyday use, as it gives a finer resolution of temperature changes and allows for more comfortable numbers in common weather conditions. For example, a pleasant day might be around 70°F on the Fahrenheit scale, while it would be around 21°C on the Celsius scale.

Both scales have advantages and disadvantages depending on the context and purpose of measurement. Therefore, it is important to know how to convert between them and understand their differences.

Sometimes, you may need to convert a temperature value from one scale to another. For example, if you are traveling to a country that uses a different temperature scale than yours, or if you are reading a scientific article that uses a different unit of measurement. In such cases, you can use some simple formulas to convert between Celsius and Fahrenheit scales.

The formula for converting a temperature in Celsius to Fahrenheit is:

$$\text{°F} = \frac{9}{5} \times \text{°C} + 32$$

To use this formula, you need to multiply the Celsius temperature by 9/5 and then add 32 to the result. For example, if you want to convert 25°C to Fahrenheit, you can do the following calculation:

$$\text{°F} = \frac{9}{5} \times 25 + 32$$ $$\text{°F} = 45 + 32$$ $$\text{°F} = 77$$

So, 25°C is equivalent to 77°F.

The formula for converting a temperature in Fahrenheit to Celsius is:

$$\text{°C} = \frac{5}{9} \times (\text{°F} - 32)$$

To use this formula, you need to subtract 32 from the Fahrenheit temperature and then multiply the result by 5/9. For example, if you want to convert 68°F to Celsius, you can do the following calculation:

$$\text{°C} = \frac{5}{9} \times (68 - 32)$$ $$\text{°C} = \frac{5}{9} \times 36$$ $$\text{°C} = 20$$

So, 68°F is equivalent to 20°C.

You can also use these formulas to check if your conversion is correct. For example, if you convert 100°C to Fahrenheit, you should get 212°F. To verify this, you can plug in the Fahrenheit value into the second formula and see if you get back the original Celsius value:

$$\text{°C} = \frac{5}{9} \times (212 - 32)$$ $$\text{°C} = \frac{5}{9} \times 180$$ $$\text{°C} = 100$$

As you can see, the conversion is correct.

These formulas are useful for converting small or moderate temperature values. However, if you need to convert very large or very small temperature values, you may find it easier to use an online temperature converter calculator instead.

If you want to convert between Celsius and Fahrenheit scales without doing the math yourself, you can use an online temperature converter calculator. There are many websites that offer this service for free, and you can easily find them by searching on Google or Bing. Here are some examples of online temperature converter calculators:

Using an online temperature converter calculator can save you time and effort when you need to switch between Celsius and Fahrenheit scales. However, it is also useful to know how to do the conversion manually, as it can help you understand the relationship between the two scales better. In the next section, we will show you how to convert between Celsius and Fahrenheit using simple formulas.

If you want to convert a temperature from Celsius to Fahrenheit, you can use the following formula:

°F = (9/5 × °C) + 32

This formula shows that you need to multiply the Celsius temperature by 9/5 and then add 32 to get the Fahrenheit equivalent.

For example, if you want to convert 25°C to Fahrenheit, you can apply the formula as follows:

°F = (9/5 × 25) + 32 °F = (45) + 32 °F = 77

So, 25°C is equal to 77°F.

You can also use an online calculator to convert Celsius to Fahrenheit quickly and easily. Just enter the Celsius temperature in the box below and click on the "Convert" button. The calculator will display the Fahrenheit temperature in the box next to it.

` Enter a temperature in Celsius: °C`

`Convert`

`Fahrenheit: °F `

Here are some common Celsius temperatures and their Fahrenheit equivalents:

Celsius | Fahrenheit |
---|---|

0°C | 32°F |

10°C | 50°F |

20°C | 68°F |

30°C | 86°F |

40°C | 104°F |

50°C | 122°F |

60°C | 140°F |

70°C | 158°F |

80°C | 176°F |

90°C | 194°F |

100°C | 212°F |

You can use this table as a reference or a quick way to convert Celsius to Fahrenheit. However, if you want more accuracy or a different temperature range, you should use the formula or the calculator.

If you want to convert a temperature from Fahrenheit to Celsius, you can use the following formula:

$$\text{°C} = (\text{°F} - 32) \times \frac{5}{9}$$

This formula can be derived from the definition of the Fahrenheit scale, which is based on the freezing point of water at 32°F and the boiling point of water at 212°F. By subtracting 32 from both sides and multiplying by 5/9, you can get the equivalent temperature in Celsius.

For example, if you want to convert 68°F to Celsius, you can apply the formula as follows:

$$\text{°C} = (68 - 32) \times \frac{5}{9}$$ $$\text{°C} = 36 \times \frac{5}{9}$$ $$\text{°C} = 20$$

So, 68°F is equal to 20°C.

You can also use an online temperature converter calculator to do the conversion for you. Just enter a temperature in Fahrenheit and click on the "Convert" button to get the corresponding temperature in Celsius.

Alternatively, you can use a temperature table that shows the equivalent temperatures in both scales from -40°C to 100°C (-40°F to 212°F). You can find such a table in point 15 of this article. Just look for the Fahrenheit temperature that you want to convert and read the corresponding Celsius temperature from the same row. For example, if you want to convert 50°F to Celsius, you can find that it is equal to 10°C in the table.

The following table shows the equivalent temperatures in Celsius and Fahrenheit scales from -40°C to 100°C (-40°F to 212°F). The table can be used to convert between the two scales or to compare the temperature values in different units.

Celsius | Fahrenheit |
---|---|

-40°C | -40°F |

-30°C | -22°F |

-20°C | -4°F |

-10°C | 14°F |

0°C | 32°F |

10°C | 50°F |

20°C | 68°F |

30°C | 86°F |

40°C | 104°F |

50°C | 122°F |

60°C | 140°F |

70°C | 158°F |

80°C | 176°F |

90°C | 194°F |

100°C | 212°F |

The table shows that the two scales have the same value at -40 degrees, which is the lowest temperature that can be measured by both scales. The table also shows that the Fahrenheit scale has a larger range of values than the Celsius scale for the same temperature difference. For example, a change of 10 degrees in Celsius corresponds to a change of 18 degrees in Fahrenheit. This means that the Fahrenheit scale is more sensitive to temperature changes than the Celsius scale. However, the Celsius scale is more convenient for scientific purposes because it is based on the properties of water and has a simpler conversion formula with the Kelvin scale, which is the absolute temperature scale.

To illustrate the differences between Celsius and Fahrenheit scales, here are some examples of how they are used in everyday life:

- Weather forecasts: Most countries use Celsius scale to report the temperature of the air, water, and soil. For example, a typical summer day in London might have a high of 25°C and a low of 15°C. However, the United States still uses Fahrenheit scale to measure the weather. For example, a typical summer day in New York might have a high of 77°F and a low of 59°F.
- Cooking and baking: Celsius scale is also widely used for cooking and baking, especially in recipes that require precise temperatures. For example, a cake might need to be baked at 180°C for 25 minutes. However, some ovens and cookbooks still use Fahrenheit scale for cooking and baking. For example, a cake might need to be baked at 350°F for 25 minutes.
- Body temperature: Celsius scale is the standard scale for measuring body temperature in most countries. For example, a normal body temperature is around 37°C. However, Fahrenheit scale is still used for measuring body temperature in the United States. For example, a normal body temperature is around 98.6°F.
- Thermometers: Celsius scale is the common scale for thermometers that are used for scientific, medical, and industrial purposes. For example, a laboratory thermometer might have a range of -10°C to 110°C. However, Fahrenheit scale is still used for some thermometers that are used for domestic or personal purposes. For example, a fever thermometer might have a range of 94°F to 108°F.

These examples show that Celsius and Fahrenheit scales are both widely used in different contexts and situations. However, Celsius scale is more popular and convenient for most purposes because it is based on the decimal system and has simpler conversion formulas. Fahrenheit scale is more complex and arbitrary because it is based on an older system and has more divisions. Therefore, it is important to know how to convert between Celsius and Fahrenheit scales when needed.

In this article, we have learned about the Celsius and Fahrenheit scales, their definitions, their differences, and their usage. We have also seen how to convert between these two scales using formulas or online calculators. We have also looked at a temperature table that shows the corresponding values of Celsius and Fahrenheit from -40°C to 100°C (-40°F to 212°F).

The main points to remember from this article are:

- The Celsius scale is based on the freezing point of water at 0°C and the boiling point of water at 100°C. It uses the symbol °C and is divided into 100 equal parts.
- The Fahrenheit scale is based on the freezing point of water at 32°F and the boiling point of water at 212°F. It uses the symbol °F and is divided into 180 equal parts.
- The Celsius scale is commonly used in areas that use metric system units and for scientific purposes. The Fahrenheit scale is mainly used in the United States and some other countries.
- To convert from Celsius to Fahrenheit, use the formula: °F = (9/5 × °C) + 32
- To convert from Fahrenheit to Celsius, use the formula: °C = (°F – 32) × 5/9
- To use an online temperature converter calculator, enter a temperature in either Celsius or Fahrenheit and click on the convert button.
- To use a temperature table, find the desired temperature in either Celsius or Fahrenheit and look at the corresponding value in the other scale.

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