What is an ideal gas?

Explanation

### Step-by-Step Solution:

1. **Definition of Ideal Gas**: An ideal gas is a theoretical gas composed of many particles that are in constant random motion. It follows the ideal gas law, which relates pressure, volume, temperature, and the number of moles of the gas.

2. **Ideal Gas Law**: The behavior of an ideal gas is described by the ideal gas law, which is given by the equation:
\[ PV = nRT \]
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