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There are two reasons for this.

The first is that a Fahrenheit degree is smaller than a Celsius degree. Four Celsius degrees is the same size as nine Fahrenheit degrees.

The second reason is that 32 degrees Fahrenheit is zero degrees Celsius.

If you put those two ideas together you figure out that -40°F = -40°C.

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Q: Why is it that temperatures at -40 degrees celsius and Fahrenheit are the same?
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Related questions

At what temperatures will the readings on the Fahrenheit and Celsius thermometers be the same?

At -40 degrees.

Why is 105 the same temperature weather it is expressed in celsius or Fahrenheit?

It is not the same:105 degrees Fahrenheit = 40.56 degrees Celsius.105 degrees Celsius = 221 degrees Fahrenheit.

What is 34.5 degree in Fahrenheit?

34.5 degrees Celsius is the same as 94.1 degrees Fahrenheit. 34.5 degrees Fahrenheit is the same as 1.4 degrees Celsius.

Is zero degrees celsius the same as zero degrees Fahrenheit?

0 degrees Celsius = 32 degrees Fahrenheit.

What is 7 degrees Celsius converted into Fahrenheit?

7 degrees Celsius is the same as 44.6 degrees Fahrenheit.

22 degrees Celsius is the same as Fahrenheit?

No, 22 degrees Celsius = 71.6 degrees Fahrenheit

How do degrees Celsius relate to degrees Fahrenheit?

The Celsius scale has its 'zero' at the same temperature as 32 on the Fahrenheit scale, and each Celsius degree is the same size as 1.8 Fahrenheit degrees.

How much is 6 degrees Celsius?

-6 degrees Celsius is the same as 21.2 degrees Fahrenheit.

What is the same between fahrenheit and celsius?

The answer is: -40. 40 degrees below zero is the same in Celsius and Fahrenheit. (233.15 kelvin)

14 degrees Fahrenheit is what degree Celsius?

-10 degrees Celsius is the same temperature as 14 degrees Fahrenheit.

What is 15000000 degrees celsius in Fahrenheit -?

Temperatures in that range are associated with stellar fusion, and are usually expressed in Kelvin, which is practically the same as Celsius for those high temperatures. However, 15 million °C would equal 27 million °F. Fahrenheit is almost never used for such high temperatures. Celsius and Kelvin are normally used. But 15 million degrees on the Celsius scale would be approximately 27 million degrees on the Fahrenheit scale.

Which is colder 56 degrees Fahrenheit or 12 degrees Celsius?

12 degrees Celsius is the same as 53.6 degrees Fahrenheit. Therefore, 12 Celsius is colder than 56 degrees Fahrenheit.