# Find the volume of the gas must decrease:

The pressure of an ideal gas undergoing isothermal change is increased by 10%. the volume of the gas must decrease by about

- 0.1%
- 9%
- 10%
- 0.9%

**Answer: (3) 10%**

**Explanation:-**

**We know that PV=nRT.**

For Isothernmal system, n, R and T are constant.

Hence, PV= ConstantP α 1/V

V is inversely proportional to P.

Then, when P is increased by 10%, V get decreased by 10%.

Hence, the correct answer is option (3) 10%.