B6D7E1 – The Principles of expansion and contraction of matter
Name: Lim Li Fern (14)
Identification Card No.: 990412-11-5206
Subject teacher: Puan Norlida
Heat does to matter is changes it state. There is something more subtle though that can cause big problems. Look at this devise. When you heat both this ball and the ring the ring expands like a long bar of metal. The ball expands less so when they are heated the ball fits through the ring. You may want to look for these and try this demo as many of you probably have these.
Another neat tool to show the expansion of metals is this bimetal bar. It is made with one metal on one side and another metal on the other side. One metal expands more rapidly so the bar twists when heated.
This affects things in the real world drastically. If this is not considered when building something we can end up with a road buckling. Engineers then plan for the expansion and contraction due to heat.
In a pipe we may see special parts like this or this so that the pipe can expand in length without breaking.
Behaviour of matter - Expansion and contractioncontraction
Substances expand or get bigger when they are heated up. They contractor get smaller when they are cooled down. This property can be useful.
* Thermometers work because the liquid inside them expands and rises up the tube when it gets hotter.
* Metal parts can be fitted together without welding using shrink fitting. The animation shows how this works.
Expansion and contraction in metal
The rod is too big to fit through the hole.
The rod is cooled, causing it to contract.
The rod fits in the hole. When warmed, it expands to fit tightly.
All matter is affected by heating and cooling. With a very few exceptions, when any matter is heated, it will expand. When it is cooled, it will contract.
Observing a Gas Expand When Heated
Procedure: Place the neck of... [continues]
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