In the hot (yellow) water, the water molecules are slightly further apart than in the cold (blue) water. The hot water is less dense and floats on the cold water. When the cold water is placed on top, ...

See if you can tell that heat makes molecules move! Place some ice in a large cup and add water to make ice water. After the water is cold, pour the ice water (without the ice) into a cup so that it ...

The water gas molecules will occupy all the space inside the can since the air molecules have been pushed out. The hot gas molecules are the same pressure as the air outside the can. When the can is ...

This expansion can crack pipes if there’s nowhere for the water to go, which is why experts recommend leaving faucets dripping during freezing temperatures. Joe Weavil with Cardinal Plumbing and Drain ...