Physics 2009 JAMB Past Questions - Question 22: If the vapour on top of an enclosed liquid is equal to the atmospheric pressure ,what will be the temperature of the liquid enclosed ?

Correct Answer

B

Explanation

The temperature of a liquid enclosed in a sealed container, where the vapor pressure on top of the liquid is equal to the atmospheric pressure, is known as the boiling point of the liquid at that specific atmospheric pressure. The boiling point is the temperature at which the vapor pressure of the liquid equals the surrounding atmospheric pressure, causing the liquid to change into a vapor or gas.

The boiling point of a liquid varies with changes in atmospheric pressure. At higher altitudes where atmospheric pressure is lower, liquids boil at lower temperatures. Conversely, at lower altitudes with higher atmospheric pressure, liquids boil at higher temperatures.

To determine the temperature of the liquid enclosed in a sealed container when the vapor pressure matches the atmospheric pressure, you would need to know the atmospheric pressure in your location or the specific conditions under which the system is operating. You can then consult a phase diagram or use tables of boiling points at different pressures for various substances to find the temperature at which the vapor pressure equals the atmospheric pressure.