Pressure

• What are the particles in gases free to do?

  Move about in completely random directions
• What happens when gas particles hit the walls of a container?

  They rebound and carry on in a different direction
• How do gas particles create pressure?

  By exerting a force whenever they collide with the walls of the container
• What is the formula for pressure?

  Pressure = force / area
• What two factors mainly determine total pressure in a gas?

  The number of collisions and the energy of each collision
• How does temperature affect gas pressure?

  • Heating gas transfers energy to particles
  • Increases kinetic energy of particles
  • Results in more collisions with container walls
  • Each collision involves more force
  • Therefore, pressure increases with temperature
• What happens to pressure if the concentration of gas particles increases while keeping the volume constant?

  Pressure increases due to more collisions with the walls
• What occurs to pressure when the volume of a container decreases while keeping the number of particles constant?

  Pressure increases due to more particles per unit of volume
• What happens to gas pressure in a flexible container like a balloon when temperature and concentration change?

  • Changes in temperature and concentration can change volume
  • Increased collisions cause the balloon to expand
  • Expansion may increase volume and pressure, but pressure may not rise significantly
• What is the relationship between volume and pressure in a gas?

  As volume decreases, pressure increases
• Why is it important to consider the shape of the container when discussing gas pressure?

  Because flexible containers can change volume with temperature and concentration changes
• What should students be aware of regarding expandable containers and gas pressure?

  That changes in collisions may cause expansion rather than increasing pressure
• What is the main takeaway from the video regarding gas behavior?

  Understanding how temperature, concentration, and volume affect gas pressure