Question

What is the effect of increase in pressure on the boiling point of a liquid?

Answer 1

In this question,we are going to see the relationship between the boiling point and pressure to find the effect of increase in pressure on the boiling point of a liquid.

Complete step by step answer:
-Depending on the pressure applied, the boiling point of a liquid varies; the normal boiling point is the temperature at which the vapour pressure is equal to the normal air pressure at sea level.
-The boiling point is lower at higher elevations, where the air pressure is also lower. Up to the critical point, where the gas and liquid properties become similar, the boiling point increases with increased pressure. Beyond the critical point, the boiling point cannot be raised.The gas pressure above a liquid influences the point of boiling. This is called air pressure in an open environment. The higher the pressure, the more energy required to boil liquids, and the boiling point is also higher.
-The ionic force is the strongest and the Van der Waals forces are the weakest. The boiling point of liquids depends on these very forces as these forces contain bonding between carbons.
-Liquids can transform through the evaporation process to a vapour at temperatures below their boiling points. Evaporation is a surface process in which molecules found on the edge of the material, not trapped on that side by ample liquid pressure, escape as vapour into the atmosphere. Boiling, on the other hand is a process in which molecules emerge from somewhere in the mixture, leading to the creation of vapour bubbles within the mixture.
Hence, we can say that the boiling point of liquid rises on increasing temperature.

Note: So, in short we can say that the boiling point of liquid rises on increasing temperature due to the fact that the energy available for the liquid molecules to expand into the gas phase also increases.