Hey Hru? 13(4)+8(78)=x

How hot is the suns corona? (integrated science)

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?

Which change to the system wood cause the freely-moving piston to lower?