Question

The volume of an ideal gas is 1 litre and its pressure is equal to 72cm of mercury column. The volume of gas is made 900 cm³ by compressing it isothermally. The stress of the gas will be

• A. 8 cm (mercury)
• B. 7 cm (mercury)
• C. 6 cm (mercury)
• D. 4 cm (mercury)

Answer 1

Answer: (A)

8 cm (mercury)

Answer 2

For isothermal process, $P_{1}V_{1} = P_{2}V_{2}$

⇒ $P_{2} = \frac{P_{1}V_{1}}{V_{2}} = \frac{72 \times 1000}{900}$=80 cm

Stress $\Delta P = P_{2} - P_{1} = 80 - 72 = 8cm$