Explain why a cup of hot water left on a countertop will eventually become cool, but a cup of room-temperature water left on the countertop will not eventually become hotter or colder. (3 marks)

Alidded glass container is filled with a colored gas. after a period of time, it is observed that the gas is uniformly spread throughout the box and that the movement has slowed considerably. next, a warm iron plate is carefully placed under the box. why is there resumed movement of the gas in the container?