**°F = 32.0 + (9/5)°C**

**°C = (°F – 32.0)(5/9)**

**Temperature Conversion – Fahrenheit – Celsius**

To convert from a **Fahrenheit temperature** to a **Celsius temperature** we have to subtract **32 degrees** from the Fahrenheit reading to get to the zero point on the Celsius scale and then adjust for the different size degrees. The ratio of the size of the degrees is **5/9** so that the relationship between the scales is represented by the following equations:

**°F = 32.0 + (9/5)°C**

**°C = (°F – 32.0)(5/9)**

## Temperature Scales

When using a thermometer, we need to mark a scale on the tube wall with numbers on it. We have to define a** temperature scale**. A ** temperature scale** is a way to measure temperature relative to a

**starting point**(0 or zero) and a

**unit of measurement**.

These numbers are arbitrary, and historically many different schemes have been used. For example, this was done by defining some physical occurrences at given temperatures—such as the **freezing** and** boiling points of water **— and defining them as 0 and 100 respectively.

There are several scales and units exist for measuring temperature. The most common are:

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