6.3.3.3 Increasing the Pressure of a Gas

Question 1

What is work?

Answer 1

• transfer of energy by a force

Question 2

What happens when you do work on a gas?

Answer 2

• increasing internal energy of a gas
• can cause an increase in the temperature of the gas

Question 3

What does pumping more gas into the same volume mean?

Answer 3

• more particles are present
• more collisions occur per unit time with the wall
• pressure increase

Question 4

What happens when more gas is added to the fixed volume?

Answer 4

• energy is transferred to the particles
• heats the gas

Question 5

What happens when a fixed number of particles at a smaller volume?

Answer 5

• particles collide with the wall which is moving inward
• particles gain momentum as the rebound velocity is greater than approaching velocity
• so as particle has greater velocity, pressure increases as particles collide with walls more frequently (time between collisions decreases)
• temperature also increases, as kinetic energy of each particle increases