# How do you calculate the ideal gas law constant?

##### 1 Answer

You do an experiment in which you measure the values of

#### Explanation:

The Ideal Gas Law is

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where **Universal Gas Constant**.

We can rearrange this to get

The units of

For example, repeated experiments show that at standard temperature and pressure (**STP**) — 273.15 K and 1 bar — 1 mol of gas occupies 22.711 L.

You can use this information to evaluate

If the pressure is measured in kilopascals (1 bar = 100 kPa), you calculate

If you use strictly SI units, then pressure is measured in pascals and volume is measured in cubic metres.

Always use the value of