Gas Pressure and Temperature

Question 1

What is the pressure of a gas caused by?

Answer 1

The random impacts of gas molecules on surfaces that are in contact with the gas.

Question 2

What happens if the temperature of a gas in a sealed container is increased?

Answer 2

The pressure increases.

Question 3

Why does the pressure of a gas in a sealed container increase if the temperature is increased?

Answer 3

Because the kinetic energy increases, which means:

• The molecules move faster, so they hit the surfaces with more force
• The number of impacts per second of gas molecules on the surfaces of the container increases
• The total force of the impacts increases

Question 4

What is Brownian motion?

Answer 4

The random motion of tiny particles in a fluid.