Question

What is the vapor pressure of water at 100 degrees Celsius?

Answer 1

Hint: The unit to measure the vapor pressure of a gas is atmosphere. Every liquid has a vapor pressure at a certain temperature. The temperature at which the liquid is going to convert into its vapor pressure is called boiling point.

Complete answer:
- In the question it is asked to calculate or find the vapor pressure of water at 100 degree Celsius.
- We know that vapor pressure is defined as the amount of pressure exerted by the vapor in equilibrium with condensed phase (liquid) at a particular temperature.
- We know that at 100 degree Celsius the water will convert into its gas phase.
- Means the temperature at which the water evaporates is 100 degree Celsius.
- Therefore the boiling point of water is 100 degree Celsius.
- At boiling point the vapor pressure of any liquid is 1 atmosphere.
- Therefore the vapor pressure of water at 100 degree Celsius is one atmosphere.
- So, 100 degree Celsius is the boiling point of the water.
- We can express the vapor pressure in the atmosphere or in mm of Hg.
1 atmosphere = 760 mm of Hg.

Note:
At boiling point the liquid state of the component is going to convert into vapor. If we condense the vapor at low temperature then we will get the liquid back. This process is called condensation. One atmosphere is equal to 760 mm of Hg.