A pressure cooker develops temperatures above that of boiling water for cooking food faster on your stove.

Question

The cooker is a fixed volume device which is sealed off so that when the water inside boils, it cannot escape. What do you think will happen to pressure inside the cooker as the temperature gets above the normal boiling point of water?

Options:

1. Pressure goes up as liquid water is converted to water vapor making more gas.
2.  Pressure goes down because there is less liquid inside the cooker, and liquid is creating the pressure.
3.  Pressure stays constant; the cooker's interior is at equilibrium.
4.  Pressure goes up because there are more water molecules inside as temperature rises.
5.  Pressure goes down because there is more space between hotter molecules in the gas.
6.  None of the above

Answer 1

The liquid water will turn to gas and increase the pressure of the gas phase. This will result in the boiling point increasing. The point of the pressure cooker is to make water boil at a higher temperature and cutting cooking time in restaurants.

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