A graduated cylinder is filled to 32.6 mL with water and a piece of granite
is placed in the cylinder, displacing
the level to 40.7 mL. What is the
volume of the granite piece in cubic
centimeters?

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?