Factors affecting 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
• What do gas particles exert when they collide with the walls of a container?

  A force
• How is pressure defined in terms of force and area?

  Pressure is the force divided by the area
• What two factors mainly determine the total pressure in a gas?

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

  Pressure increases with temperature
• What happens to gas particles when the gas is heated?

  They move around faster
• What is the effect of increased particle collisions on pressure?

  It leads to higher pressure
• What happens to pressure if the concentration of gas particles increases while keeping the volume the same?

  Pressure increases
• How does reducing the volume of a container affect pressure?

  Pressure increases
• What is the relationship between volume and pressure in a gas?

  As volume decreases, pressure increases
• What happens to the pressure in a flexible container like a balloon when temperature or concentration changes?

  It may change the volume of the container rather than the pressure
• What does an increase in the number or force of collisions in a balloon cause?

  It causes the balloon to expand
• What should you be aware of regarding expandable containers?

  They complicate the relationship between pressure and volume
• What are the main factors affecting gas pressure?

  • Temperature: Higher temperature increases pressure
  • Concentration: More particles increase pressure
  • Volume: Smaller volume increases pressure
• How do gas particles behave in a container?

  • Move randomly
  • Collide with walls
  • Exert force upon collision
  • Create pressure based on collisions and energy