pt 2.3

Proton: My friend, I have a question
Nuetron: Oh , What is it?
P: Why do metal rail tracks have gaps? What makes the liquid in the thermometer move?
Why don't we pump car tires to maximum pressure on hotter days?
But the reason for every thing is because of heat.
N: You are really very observant and curious.
P: Oh? really?
What does heat do on solids?
:There is a relative increase in the size of solids when heated.
N: Yes, heat has effects on the different states of matter.
When a solid is heated, its atoms vibrate faster about their fixed points.
P: Uhm , metal rail tracks are solid, is it the reason why they put gaps?
N: Yes, metal railway tracks have small gaps so that when the sun heats them, the tracks expand into these gaps and don't buckle/
P: What about in liquids?
N: Liquids expands for the same reason,
but because the bonds between separate molecules are usually less tight they expand more than solids.
P: Oh, is it the reason why the liquid in thermometer moves?
N: This is the principle behind liquid-in-glass thermometer. An increase in temperature results in the expansion of the liquid which means it rises up the glass.

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