Question

1.2 litre of Hydrogen at 137° C and 106
dyne/cm2
pressure expands isothermally, until its volume is
tripled. Find the pressure of gas.

Answer 1

During the isothermal process the temperature remains constant, so Boyle's law is applicable:

$P_1V_1=P_2V_2$

$V_2=3V_1=1.2L\times3=3.6L$

Therefore, $P_2=\frac{P_1V_1}{V_2}=\frac{106dyn/cm^2\times1.2L}{3.6L}=35.3dyn/cm^2$

Answer: 35.3 dyn/cm²