Learn the Temperature Where Fahrenheit and Celsius Are the Same (2024)

Celsius and Fahrenheit are two important temperature scales. The Fahrenheit scale is used primarily in the United States, while Celsius is used throughout the world. The two scales have different zero points and the Celsius degree is bigger than the Fahrenheit.

However, there is one point on the Fahrenheit and Celsius scales where the temperatures in degrees are equal. This is -40 °C and -40 °F. If you can't remember the number, there is a simple algebraic method to find the answer.

Key Takeaways: When Does Fahrenheit Equal Celsius?

  • Celsius and Fahrenheit are two temperature scales.
  • The Fahrenheit and Celsius scales have one point at which they intersect. They are equal at -40 °C and -40 °F.
  • The simple method to find when two temperature scales are equal to each other is to set the conversion factors for the two scales equal to each other and solve for temperature.

Setting Fahrenheit and Celsius Equal

Rather than converting one temperature to another (which is not helpful because it assumes you already know the answer), you can set degrees Celsius and degrees Fahrenheit equal to each other using the conversion formula between the two scales:

°F = (°C * 9/5) + 32
°C = (°F - 32) * 5/9

It does not matter which equation you use; simply use x instead of degrees Celsius and Fahrenheit. You can solve this problem by solving for x:

°C = 5/9 * (°F - 32)
x = 5/9 * (x - 32)
x = (5/9)x - 17.778
1x - (5/9)x = -17.778
0.444x = -17.778
x = -40 degrees Celsius or Fahrenheit

Working using the other equation, you get the same answer:

°F = (°C * 9/5) + 32
°x - (°x * 9/5) = 32
-4/5 * °x = 32
°x = -32 * 5/4
x = -40°

More About Temperature

You can set two scales equal to each other to find when any of them intersect. Sometimes it's easier to just look up the equivalent temperature. This handy temperature conversion scale may help you out.

You can also practice converting between temperature scales:

Learn the Temperature Where Fahrenheit and Celsius Are the Same (2024)

FAQs

Learn the Temperature Where Fahrenheit and Celsius Are the Same? ›

There are two important temperature scales

temperature scales
The Celsius scale, also known as the centigrade scale, is a temperature scale based on 0o for the freezing point of water and 100o for the boiling point of water. This scale was first introduced by (and is named after) the Swedish physicist, astronomer, and engineer Anders Celsius.
https://byjus.com › chemistry › celsius-scale
, Celsius and Fahrenheit used in the world. There is a point on both scales where the temperatures in degrees
degrees
A degree can be defined as a set change in temperature measured against a given scale; for example, one degree Celsius is one-hundredth of the temperature change between the point at which water starts to change state from solid to liquid state and the point at which it starts to change from its liquid to gaseous state ...
https://en.wikipedia.org › wiki › Degree_(temperature)
are equal. This is - 40 ° C and - 40 ° F .

How to find the temperature where Celsius and Fahrenheit are the same? ›

The Fahrenheit and Celsius scales have one point at which they intersect. They are equal at -40 °C and -40 °F. The simple method to find when two temperature scales are equal to each other is to set the conversion factors for the two scales equal to each other and solve for temperature.

Why are 40 Celsius and Fahrenheit the same temperature? ›

The Conversion

This means Celsius is 1.8 times larger than Fahrenheit. To put another way, 1 degree Fahrenheit is 5/9 degree Celsius. Despite the pretty large differences between one another, these two temperature scales intersect at -40 degrees, meaning that -40 degrees Fahrenheit is the same as -40 degrees Celsius.

At which temperature do Fahrenheit scale and Celsius scale show the same reading? ›

So the temperature when both the Celsius and Fahrenheit scales are the same is -40 degrees.

What temperature in Fahrenheit is Celsius? ›

Step 1: One degree of °C equals 1.8 °F. (Or it is 9/5, but I think 1.8 is easier to think).

What temp is the same in both F and C? ›

There is a point on both scales where the temperatures in degrees are equal. This is - 40 ° C and - 40 ° F .

What is the formula for Celsius to Fahrenheit? ›

Important Points on C to F Conversion:

The Centigrade to Fahrenheit formula is, °F = °C × (9/5) + 32. The formula can be simply remembered without fractions as 5(°F) = 9(°C) + 160.

How do the Fahrenheit and Celsius temperature scales compare? ›

Both scales have their own thermometer for measurements. Fahrenheit scale is proposed by taking 32 °F as a freezing point of water and 212 °F as a boiling point of water. Whereas in the Celsius scale 0 °C is the freezing point of water and 100 °C is the boiling point of water.

At what temperature are Celsius and Fahrenheit double? ›

Answer and Explanation:

The point at which the temperature in Fahrenheit is exactly twice that in Celsius is 320° Fahrenheit, which is equal to 160° Celsius.

How are the Celsius and Fahrenheit temperatures related? ›

The relation between Celsius and Fahrenheit is proportional. Both have a different freezing point of water and both follow the varied unit difference between each scale.

How do you convert F to C easily? ›

Super-easy formula
  1. Fahrenheit to Celsius, subtract 30 then divide by 2.
  2. Celsius to Fahrenheit, multiply by 2 then add 30.
Dec 22, 2022

What is an example of Fahrenheit to Celsius? ›

For example, if we need to convert 40 degrees Fahrenheit to Celsius, we will substitute the value of Fahrenheit in the formula to get, °C = (40° - 32) × 5/9 = 4.4°C. This means, 40° F = 4.4°C.

What is the formula for Fahrenheit to Celsius? ›

What is the Formula to Convert Fahrenheit to Celsius? The Fahrenheit to Celsius formula is expressed as °C = (°F - 32) × 5/9; in which the value of F (Fahrenheit) is substituted and we get the value in Celsius. This formula converts the given temperature value from Fahrenheit to Celsius.

Where do C and F converge? ›

The Fahrenheit and Celsius scales converge at -40°. Ie, Temperature which shows the same measurement in Celsius and Fahrenheit= -40°. The formula used to convert Celsius(C) into Fahrenheit(F) is: F = 9 5 × C + 32.

In which temperature are kelvin and Fahrenheit the same? ›

Remember, Kelvin temperature is not expressed using degrees, just a capital letter K. This is basically the same as saying Kelvin equals the Celsius value plus 273.15. Remember to check your work. The only temperature where the Kelvin and Fahrenheit values will be equal is at 574.25.

References

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