# Can someone explain me how this 1.8F came? I know that change in temperature in Celsius scale is equal to change in temperature in Kelvin scale. But, what about Fahrenheit scale?

##### 2 Answers

See the explanation below

#### Explanation:

To convert from the Centigrade Scale to the Fahrenheit Scale, we apply the equation

as the Fahrenheit Scale ranges from

The Centigrade Scale ranges from

Therefore,

In constructing a device and a scale to measure temperature, phase transition of water was used as reference.

**Centigrade**: In the centigrade scale, the temperature interval between the melting point of ice and boiling point of water was uniformly divided into 100 intervals. So the melting point of ice and boiling point of ice are 100 units away in this scale.

**Fahrenheight**: In the Fahrenheit scale, the dial was constructed to sweep exactly

Therefore,

Since the temperature intervals were divided uniformly in both scales, these two scales must be linearly related to each other.

Therefore,

Now, coming to the temperature differences,