as the pressure on a liquid is changed from 100.kPa to 120.kPa, the temperature at which the liquid will boil

The boiling point is defined as the temperature at which the vapor pressure of the liquid equals the atmospheric pressure. So as the pressure is increased, the vapor pressure must be higher if pressure is higher and how do we get a higher vapor pressure. Lower T or higher T?

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To determine how the temperature at which a liquid will boil changes as the pressure is altered, we need to consider the relationship between pressure and boiling point temperature. This relationship is described by the principle known as the "boiling point elevation."

According to the principle, when the pressure on a liquid increases, its boiling point temperature also increases. Conversely, when the pressure decreases, the boiling point temperature decreases as well.

In this case, as the pressure on the liquid increases from 100 kPa to 120 kPa, we can conclude that the boiling point temperature will increase. Therefore, the answer is: the temperature at which the liquid will boil will increase.