Thermodynamics Question 222
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
[UPSEAT 1999]
Options:
A) 8 cm (mercury)
B) 7 cm (mercury)
C) 6 cm (mercury)
D) 4 cm (mercury)
Show Answer
Answer:
Correct Answer: A
Solution:
For isothermal process $ P _{1}V _{1}=P _{2}V _{2} $
Therefore
$ 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 $
