What causes gas pressure in a container?
Gas particles collide with the container walls, exerting force per unit area.
Cambridge IGCSE (9–1) Physics 0972 (Extended) (2026–2028) · 2.1.3
Revise Cambridge IGCSE (9–1) Physics 0972 (Extended) (2026–2028) specification point 2.1.3, Gases and the absolute scale of temperature, with free active-recall flashcards. Flip through the set or review every question and answer below.
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What causes gas pressure in a container?
Gas particles collide with the container walls, exerting force per unit area.
How does increasing the temperature of a fixed mass of gas at constant volume affect its particles’ average kinetic energy?
Their average kinetic energy increases.
How do faster-moving gas particles affect their collisions with container walls?
They collide more frequently and with greater force.
How does changing the temperature affect the pressure of a fixed mass of gas at constant volume?
Increasing the temperature raises the pressure; decreasing it lowers the pressure.
How do gas particles produce pressure on a container wall?
They collide with the wall, exerting a force per unit area.
How and why does changing the volume affect the pressure of a fixed mass of gas at constant temperature?
Decreasing volume increases wall collisions per unit area and increases pressure. Increasing volume reduces the collision rate per unit area and decreases pressure.
What happens to the average kinetic energy of gas particles when the temperature remains constant?
It remains unchanged.
What is the kelvin?
The unit of the absolute temperature scale, whose zero is absolute zero.
How do the kelvin and Celsius scales compare in interval size and zero point?
One kelvin and one degree Celsius are the same-sized interval, but the scales have different zero points.
How do you convert temperatures between degrees Celsius and kelvin?
Approximately what Celsius temperature corresponds to absolute zero?