Question

a balloon kept in sun , burst after some time . why ?

Answer 1

When the balloon is kept in the sun, due to Sun's heat, the kinetic energy of gaseous particles inside the balloonsalso gets increased and the balloonexpands. This will increase the pressure on the walls of the balloon. It continues to expand and comes to a stage when the baloon bursts.

Answer 2

A balloon when kept in sun bursts after some time because outside the temperature is high and due to that the kinetic energy increases and the molecules of gas particles inside exerts a pressure on the walls of the balloon so it will continue to expand and there a stage will come that the balloon will burst..