Pressure in Gases

• What causes the pressure of a gas?

  Particles colliding with the walls of the container
• What does the force from particle collisions act upon?

  At right angles to the walls of the container
• How does the force from particle collisions affect gas pressure?

  It causes gas pressure over the area of the container
• What happens to gas pressure when the volume of the container increases?

  Gas pressure decreases
• Why does increasing the volume reduce gas pressure?

  Particles travel further before colliding
• What is the relationship between pressure and volume of a gas?

  Pressure is inversely proportional to volume
• What equation represents the relationship between pressure and volume?

  Pressure × Volume = Constant
• Under what condition is the pressure-volume equation valid?

  If the temperature is kept constant
• If the pressure of a gas doubles, what happens to the volume?

  Volume must be halved
• What is the pressure of a gas with a volume of $2 \text{ m}^3$ and pressure $400,000 \text{ pascals}$ when the volume increases to $6 \text{ m}^3$?


  $133,334 \text{ pascals}$
• What is the volume of a gas that has a pressure decrease from $150,000 \text{ pascals}$ to $50,000 \text{ pascals}$ if the initial volume is $5 \text{ m}^3$?


  $15 \text{ m}^3$
• If a gas has a volume of $10 \text{ m}^3$ and pressure $50,000 \text{ pascals}$, what is the pressure when the volume increases to $50 \text{ m}^3$?


  $10,000 \text{ pascals}$
• What steps should you follow to calculate changes in gas pressure or volume?

  1. Identify initial pressure and volume
  2. Determine the change in volume or pressure
  3. Use the equation: Pressure × Volume = Constant
  4. Calculate the new pressure or volume
• What are the key concepts related to gas pressure and volume?

  • Pressure is due to particle collisions
  • Force acts at right angles to container walls
  • Pressure decreases with increased volume
  • Pressure is inversely proportional to volume
  • Equation: Pressure × Volume = Constant (at constant temperature)