Copyright © University of Cambridge. All rights reserved.

## 'Temperature' printed from http://nrich.maths.org/

Temperature is often measured in degrees Celsius,$^\circ C$, or degrees Fahrenheit,$^\circ F$.

The freezing point of water is $0^\circ$C and $32^\circ$F.

The boiling point of water is $100^\circ$C and $212^\circ$F.

**Is there a temperature at which Celsius and Fahrenheit readings are the same?**

Can you describe a way of converting Fahrenheit readings into Celsius?

Can you describe a way of converting Celsius readings into Fahrenheit?

**An extension challenge:**

Scientists often use the Kelvin scale of temperature, where the freezing point of water is $273.15^\circ K$ and the boiling point of water is $373.15^\circ K$.

Is there a temperature at which Kelvin and Fahrenheit readings are the same?

Is there a temperature at which Kelvin and Celsius readings are the same?

Can you describe ways of converting Kelvin readings into Fahrenheit and Celsius readings?

Click here for a poster of this problem.