How does the boiling point of a liquid vary with pressure?

Answer 1

Something boils when its vapor pressure equals the atmospheric (barometric) pressure above it. When the two are equal, that defines the boiling point.

Therefore, you can either boil something by heating the liquid, and thus raising its vapor pressure (vapor pressure goes up with temperature), or you can boil something by reducing the atmospheric pressure above it until it matches the vapor pressure.

See the Related Questions links to the left for more information about how the boiling point of water changes with elevation and atmospheric pressure.

Answer 2

Atmospheris pressure varies above the sea level .With the change in the atmospheric pressure the boiling point of water also changes.With the increase in pressure the boiling point of the water increases and with the decrease in the pressure the boiling point of the water decreases.

Answer 3

The boiling point of a liquid decreases with pressure.

For example, if you went up a mountain and tried to boil a potato (as Darwin did in 1835 I believe) it would not work because the water would boil away before it got hot enough to cook the potato sufficiently.

Answer 4

The boiling point of a liquid decreases with decreasing pressure and increases with increasing pressure. This is because at higher pressures, more energy is required to overcome the external pressure and allow the liquid to change into a gas, resulting in a higher boiling point. Conversely, at lower pressures, less energy is needed, leading to a lower boiling point.

Answer 5

At a low pressure the boiling point is lower; at high pressure the boiling point is higher.

Answer 6

True, yes it does change with the barometric pressure!

Answer 7

The atoms in the water speed up when there is less room(pressure), making the water boil.

Answer 8

Raising the pressure the boiling point increase; lowering the pressure the boiling point decrease.

Answer 9

At low pressure the boiling point is lower.