Pressure is the force exerted per unit area , measured in pascals (Pa).

Which area should be used when calculating the pressure exerted by a force on a surface?

The cross-sectional area — the area where the force acts at right angles to the surface.

Define Brownian motion .

Brownian motion is the random motion of tiny particles in a fluid, caused by collisions with fast-moving molecules.

Explain why increasing the temperature of a gas at constant volume increases its pressure.

The molecules move at a higher speed , so they collide with the container walls more frequently and with greater force , increasing the pressure.

At constant volume, increasing the temperature of a gas ______ its pressure.

At constant volume, increasing the temperature of a gas increases its pressure.

True or False? Gas molecules travel in a fixed, repeating path between collisions.

False. Gas molecules move in random motion, with no fixed path, undergoing sudden changes in direction when they collide with the container walls or other molecules.

Define absolute zero .

Absolute zero is the temperature at which the molecules in a substance have zero kinetic energy , equal to -273 °C.

Why do gas particles exert no pressure on their container at absolute zero?

At absolute zero the particles have zero kinetic energy and are no longer moving , so they cannot collide with the container walls.

The Kelvin scale begins at absolute zero, where 0 K is equal to ______ .

The Kelvin scale begins at absolute zero, where 0 K is equal to -273 °C .

True or False? A temperature in kelvin can be a negative value.

False. Since the Kelvin scale begins at absolute zero , it is not possible to have a temperature below 0 K.

How does a change in temperature of 1 K compare to a change in temperature of 1 °C?

They are equal — an increase of 1 K is the same size change as an increase of 1 °C .

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Particle Model & Pressure (Edexcel GCSE Combined Science: Physics): Flashcards

Exam code: 1SC0

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Cards in this collection (13)

Define pressure.
Pressure is the force exerted per unit area, measured in pascals (Pa).
State the equation linking pressure, force and area.
$p = \frac{F}{A}$
Which area should be used when calculating the pressure exerted by a force on a surface?
The cross-sectional area — the area where the force acts at right angles to the surface.
Define Brownian motion.
Brownian motion is the random motion of tiny particles in a fluid, caused by collisions with fast-moving molecules.
Explain why increasing the temperature of a gas at constant volume increases its pressure.
The molecules move at a higher speed, so they collide with the container walls more frequently and with greater force, increasing the pressure.
At constant volume, increasing the temperature of a gas ______ its pressure.
At constant volume, increasing the temperature of a gas increases its pressure.
True or False?
Gas molecules travel in a fixed, repeating path between collisions.
False.
Gas molecules move in random motion, with no fixed path, undergoing sudden changes in direction when they collide with the container walls or other molecules.
Define absolute zero.
Absolute zero is the temperature at which the molecules in a substance have zero kinetic energy, equal to -273 °C.
Why do gas particles exert no pressure on their container at absolute zero?
At absolute zero the particles have zero kinetic energy and are no longer moving, so they cannot collide with the container walls.
State the equation used to convert a temperature T in kelvin to a temperature θ in Celsius.
$θ / ° C = T / K - 273$
The Kelvin scale begins at absolute zero, where 0 K is equal to ______.
The Kelvin scale begins at absolute zero, where 0 K is equal to -273 °C.
True or False?
A temperature in kelvin can be a negative value.
False.
Since the Kelvin scale begins at absolute zero, it is not possible to have a temperature below 0 K.
How does a change in temperature of 1 K compare to a change in temperature of 1 °C?
They are equal — an increase of 1 K is the same size change as an increase of 1 °C.

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