Question

What is the effect of pressure during boiling point?

Answer 1

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

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.