Effects of Heat

Contraction

Firstly, we heated some water in a can using a bunsen burner. When the steam came out, we turned the burner off. We turned the can upside down on the cold water we prepared. The tin imploded as the heat left the can. This happens because the heated particles leave the can to try and find heat.

Expansion

Firstly, we tested to see if the metal ball would fit through the metal hoop. Next, we heated the ball, and when we tried to put it back through the hoop, it didn't fit. This happens because heat makes the solid less dense. Therefore, expanding the ball.

Conduction

As the heat of the bunsen burner conducted along the metal rod, the petroleum jelly holding the pins melted and the pins dropped on the table. The heat travelled along the rod slowly, therefore giving the pins different times to drop. Here are our times:

The first pin dropped in 4.41 seconds.

The second one dropped on 14.28 seconds.

The third one dropped at 27.43 seconds.

The fourth one dropped at 53.88 seconds.

The last pin dropped at 1 minute 46 seconds.

Convection in liquid

Firstly, we heated water in a beaker using a bunsen burner. We then put a straw and put some permanganate crystals through it. The crystal particles went up and down through the hot water. This happens because heat makes things less dense and lighter. As soon as the crystal particles cooled down, they went down to the surface.

Convection in gas

 Firstly, we cut off the top bit of the teabag, made it into a cylinder and made it stand on the table. We then lit it on fire, starting from the top. The teabag flew in the air as it disintegrated. This happens because the heat made it lighter, lifting it into the air.