Please answer the last 3 in the last column. I will give you points, 5 stars, thanks, and a BRAINLIEST if you pls answer it correctly! Thank you so much and have a good day :)

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?