Question

why does temperature variations not visible in a thermometer when a solid change into liquid or a liquid into gas?​

Answer 1

Answer:

All three states of matter (solid, liquid and gas) expand when heated. The atoms themselves do not expand, but the volume they take up does.

When a solid is heated, its atoms vibrate faster about their fixed points. The relative increase in the size of solids when heated is therefore small. Metal railway tracks have small gaps so that when the sun heats them, the tracks expand into these gaps and don’t buckle.

Liquids expand for the same reason, but because the bonds between separate molecules are usually less tight they expand more than solids. This is the principle behind liquid-in-glass thermometers. An increase in temperature results in the expansion of the liquid which means it rises up the glass.

Molecules within gases are further apart and weakly attracted to each other. Heat causes the molecules to move faster, (heat energy is converted to kinetic energy) which means that the volume of a gas increases more than the volume of a solid or liquid.

However, gases that are contained in a fixed volume cannot expand - and so increases in temperature result in increases in pressure.

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Answer 2

lo temperature variation is seen in the thermometer when are solid changes into liquid or liquid changes into gas due to the latent heat.

Explanation:

• The latent heat is the type of heat which is required by a substance to get rid of the strong intermolecular force of attraction

• as a result of this there is gain of heat without rise in temperature when there is a change from one state to the other. for example in case of solid the molecules are placed very close to each other. When they are converted into liquid at the melting point then heat is taken to get rid of the inter particular force of attraction.

To know more about latent heat,

What do you mean by Latent heat? Explain latent heat of fusion and .

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