Particle Model & PressureEdexcel GCSE Physics: Flashcards

Card 1 of 110 of 11 known

Question

What causes gas pressure at the particle level?

Tap or press Space to reveal

Tap card or press Space to flip

See all 11 cards

What causes gas pressure at the particle level?: Particles colliding with the walls of their container, exerting a force on them.
In what direction does gas pressure act on a surface?: At right angles (normal) to the surface.
What happens to gas pressure at constant volume if temperature increases? Why?: Pressure increases — particles move faster, so they collide with the walls more frequently and with greater force.
What is absolute zero in °C?: −273 °C.
What is special about particle motion at absolute zero?: Particles have the minimum possible kinetic energy (theoretically no movement).
How do you convert from Celsius to kelvin?: Add 273: K = °C + 273.
State the equation relating pressure and volume for a fixed mass of gas at constant temperature.: P₁ × V₁ = P₂ × V₂.
Why does decreasing the volume of a gas at constant temperature increase its pressure?: Particles have less space, so they collide with the container walls more frequently.
Why does a bicycle pump get warm when used?: Work done compressing the air increases the kinetic energy of the gas particles, raising its temperature.
A gas at 200 kPa and 3 m³ is compressed to 1 m³ at constant temperature. What is the new pressure?: P₂ = P₁V₁/V₂ = (200×3)/1 = 600 kPa.
Convert 0 °C to kelvin.: 273 K.