Can Matter Change its State

Can Matter Change its State

Change of state of matter

• A substance may exist in any of the three states of matter (i.e. solid, liquid or gas) depending upon the conditions of temperature and pressure.
• By changing the conditions of temperature and pressure, a substance can be made to exist as solid, liquid or a gas.
• A solid on heating usually changes into a liquid which on further heating changes into gas. Similarly, a gas on cooling condenses into a liquid which on further cooling changes into a solid.

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The most familiar and common example is water. It exists in all the three states:

1. Solid : ice
2. Liquid : water and
3. Gas : water vapour

Ice is a solid state and may be melted to form water (Liquid) which on further heating changes into steam (gas). These changes can also be reversed on cooling.

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