Name the gas law which relates volume and pressure of gas at constant temperature.

Explanation

**Step-by-Step Solution:**

1. **Identify the Relationship**: We need to identify the gas law that relates the volume and pressure of a gas while keeping the temperature constant.

2. **Recall the Gas Laws**: Among the various gas laws, we should recall the specific laws that deal with pressure and volume. The most relevant law here is Boyle's Law.

3. **State Boyle's Law**: Boyle's Law states that at constant temperature, the pressure (P) of a gas is inversely proportional to its volume (V). This can be mathematically expressed as:
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