Lesson 4, Topic 3
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The effect of pressure and temperature on particles

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The volume of a gas depends on its pressure and temperature

  1. Increasing the pressure of a gas will decrease its volume. The opposite is also true – decreasing the pressure will increase the volume

  2. Increasing the temperature of a gas will increase its volume. The opposite is also true – decreasing the temperature will decease the volume

The volume of a gas increases as the pressure decreases

The pressure of a gas is due to the particles colliding with the walls of the container that the gas is held in

  • If gases are compressed into a smaller volume, there will be more particles hitting the container wall every second

  • The more frequent the collisions with the container wall the higher the pressure

The pressure of a gas increases as the temperature increases

 

  • Increasing the temperature makes particles move faster and increases the frequency of collisions with the container walls

  • Therefore, increasing the temperature increases the pressure if the volume stays constant