Sound travels fastest through what?

a. space

b. cool air

c. warm air

d. a metal spoon

Why are pipes bursting in the in extremely cold weather?

Which of the following is most likely true about water in chemical solutions?

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?