The pressure of a given mass of a gas filled in a vessel of volume V at constant temperature is reuced to `1//3` rd of its initial value. Calculate the percentage change in its volume.

Explanation

To solve the problem, we will use Boyle's Law, which states that for a given mass of gas at constant temperature, the product of pressure and volume is constant. This can be expressed as:

\[ P_1 V_1 = P_2 V_2 \]

Where:
- \( P_1 \) = initial pressure
- \( V_1 \) = initial volume
- \( P_2 \) = final pressure
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