Question

Q.What is effect of pressure(atmospheric pressur) on melting and boiling point?
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Answer 1

Answer:

When atmospheric pressure increases, the boiling point becomes higher, and when atmospheric pressure decreases (as it does when elevation increases), the boiling point becomes lower. Pressure on the surface of water tends to keep the water molecules contained. ❤

Answer 2

Answer:

melting point (MP) and boiling point (BP) of most substances are directly proportional to the atmospheric pressure (ATM).

That means on increasing the ATM, the MP and BP of most substances increases while they decreases on decreasing the ATM.

But some substances that contract on heating for example, between 0°C and 4°C, the melting point decreases on increasing the ATM.