Question

What is the effect of pressure on the melting point and the boiling point of a substance.​

Answer 1

Answer:

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Explanation:

Increasing pressure usually increases the boiling point of a liquid. A way to think about it is that the molecules of the liquid need more energy to break into the gas phase when the more molecules are hitting the surface of the liquid with more energy. For melting point, increasing the pressure makes some difference.

Answer 2

If the volume of the solid is greater than the liquid phase, as in the case of water, then more pressure actually lowers the melting point a little bit. Increasing pressure usually increases the boiling point of a liquid.

OR, in other words

As vapour pressure increases, boiling point decreases bcoz boiling point is the temperature at which temperature of liquid become equal to the atmospheric pressure.On increasing pressure,temperature will increase and hence melting of a substance takes place with a faster rate that is melting point decreases.

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