Mabel conducted an experiment as shown in the diagram below. in each set-up, a conical flask was filled with identical volumes of air at different temperatures. the set-ups were then left until the air in the flasks reached room temperature. state if the red-coloured oil drops in each set-up will increase, decrease or remain at the same height at the end of the experiment. explain your answer in terms of heat gain or heat loss.
(the pic is suggested ans, i don't understand why since i think it should be the opposite)