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The Fahrenheit scale was used much more some years ago. Such a thermometer gives the temperature of freezing water as 32 degrees F ( I don't have the sign for "degree" on my keyboard so I'll use the sign ^ instead.) So freezing point would be 32^F The temperature at which water boils is 212^F This means that there are 180 degree steps from freezing to boiling.

Now the Centigrade scale records the freezing point of water as 0^C, and boiling point of water is 100^C So this temperature scale has only 100 degree steps from freezing to boiling. You can easily see that "centi grade" means "100 graduations" from freezing to boiling.

If you want to change a F temperature to a C temperature, here is the formula:

First subtract 32^ from the F temperature. Then multiply by 5 and divide by 9

C^ = (F^ - 32) X 5/9

To change from C to F you divide C by 5 and multiply by 9, finally adding 32

F^ = (C^ x 9/5) + 32

One favourite exam question for "o" level is "Which temperature has the same number of degrees on both F and C scales?" The answer is -40^C = -40^F

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14y ago

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