Which set of conditions represents the easiest way to liquify a gas ? A. Low temperature and high pressure B. High temperature and low pressure C. Low temperature and low pressure D. High temperature and high pressure

The correct answer is A. Low temperature and high pressure.

To liquify a gas, you need to reduce the temperature and increase the pressure. This is because the molecules in a gas are moving very quickly, and they need to be slowed down in order to form a liquid. The pressure helps to keep the molecules close together, so that they can form a liquid.

At high temperatures, the molecules in a gas are moving too quickly to form a liquid. The pressure will not be able to slow them down enough, and the gas will remain a gas.

At low temperatures, the molecules in a gas are moving more slowly. The pressure can now help to

slow them down enough to form a liquid.

Therefore, the easiest way to liquify a gas is to reduce the temperature and increase the pressure.