Meaning of contraction
Contraction is a process or result of making or becoming smaller or shorter.
meaning of Expansion
Expansion is a act of something becoming larger or more extensive.In one of our experiment we did a ball and hop test.A small ball is attached to a rod and a rod is also attached to a small hop.They fit perfectly if they are not heated.Once heated the ball expands and the ball doesn't fit but once you cool the ball down the ball fits perfectly.
conduction
conduction is when heat travels through something from on end to another.We did a experiment with a rod and some pins.we had to put Vaseline on top of the pins and then attached them on a metal rod.once the Bunsen burner heat touches the rod the first pin drops instantly and the other pins drops when the heat get to it from the rod.
convection
convection is is when heat travels through a liquid or a gas.Solids vibrate more. liquid and gases when they are heated become less dense and rise.Therefore hot liquids and gases will move up and when they cool they move down.
convection in gas
Convection transfers heat heat by movement of fluid,liquid or gas between areas with different temperature.We did a experiment using tea bags,We first had to cut the tea back open then take out the tea leaf and we use the paper part that was left.We lit them on fire and once the fire reached the end the paper flung up and started disappearing.
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