Answer to Question #208362 in Mechanical Engineering for Mohamed sadique

Question

A balloon in its flat and collapsed state is filled with helium gas at constant pressure 101 kPa slowly. If it attains a sphere of radius 0.8 m during the reversible process, estimate the work done by helium.

Answer 1

Work done by the gas during the filling process   = $\intop v dp$

$= (\frac{4}{3}\pi r^3) \times 101 =21$6.61 kJ