Why boiling point is increased with the increase of external pressure?

Answer 1

A definition of boiling point is when the vapor pressure of the liquid equals the ambient atmospheric pressure, thusly if you increase the pressure the vapor pressure must also increase and to do this you have to increase the temperature. Shinolaman

Answer 2

Increasing the external pressure on a liquid increases the intermolecular forces between the molecules, making it harder for the molecules to escape the liquid phase and transition into the gas phase. As a result, the liquid will need to reach a higher temperature (boiling point) in order to overcome this increased pressure and vaporize.

Answer 3

A definition of boiling point is when the vapor pressure of the liquid equals the ambient atmospheric pressure, thusly if you increase the pressure the vapor pressure must also increase and to do this you have to increase the temperature. Shinolaman

Answer 4

the boiling time is that temp at which the pressure of water becomes equal to the environment now by increasing environment pressure under which water is boiling the boiling point will also increase

Answer 5

There is an attemp for liquids to evaporate due to molecular motion. The boiling point is the temperature at which the kinetic energy of the molecules is great enough for all of the molecules to leave the liquid phase. External pressure 'fights' this attempt because as the molecules leave the surface of the liquid they collide with the gas creating that external pressure and those gas molecules may 'push' the boiling molecules back into the liquid. When external pressure is increased there will be more of those collisions to push the substance back into liquid phase so more energy is needed for the liquid molecules to overcome the 'push' back into liquid form. This increases the boiling point.

Answer 6

Boiling point increases as the external pressure increases. This can be explained by the kinetic theory. When a liquid boils, its particles escape into the air. A few particles can escape at any temperature, which is why a liquid evaporates, but the process is inhibited by collisions with air molecules, so many particles are knocked back down again. As the temperature of the liquid is raised, more and more particles have enough energy to escape, until we get to the boiling point when they all have enough energy.

Atmospheric pressure affects this process in the following way. If there is higher pressure, there are more air molecules per centimetre cubed (they are more crowded together). This means escaping liquid particles are more likely to collide with them. We need to provide more energy to get them all to escape, so the point at which this happens is a higher temperature.

Answer 7

Boiling point of a material is the temperature at which vapour pressure equals external pressure. As external pressure increases, vapour pressure increases boiling point increases

Answer 8

When pressure increases,more force is exerted on the liquid so more temperature is required to convert a liquid into its gaseous state

Answer 9

Increasing the pressure the boiling point is lowered.

Answer 10

because of intermolecular distances