As shown , a piston chamber pf cross section area `A` is filled with ideal gas. `A` sealed piston of mass m is right at the middle height of the cylinder at equilibrium. The friction force between the chamber wall and the piston can be ignored . The mass of the rest of the chamber is `M`.The atmosphere pressure is `P_(0)`. Now slowly pull the piston upwards , find the maximum value of `M` such that the chamber can be lifted off the ground. The temperature remains unchanged.