Most materials are subject to thermal expansion: a tendency to expand when heated, and to contract when cooled. For this reason, bridges are built with metal expansion joints, so that they can expand and contract without causing faults in the overall structure of the bridge. Other machines and structures likewise have built-in protection against the hazards of thermal expansion. But thermal expansion can also be advantageous, making possible the workings of thermometers and thermostats.
This is very interstring i read it all.
I have learnt alot about this, is there any other websites i can view.
Lots and lots of thanks and love to thhe staff that made this!
Gavin
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