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Pressure and pressure differences in fluids (physics only) key terms
Use these key terms for Pressure and pressure differences in fluids (physics only) in AQA Physics 8463. The page is built from approved learning objectives for this topic and links back to the wider unit, topic hub, and related revision assets.
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key terms
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Pressure and pressure differences in fluids (physics only)
Key terms
Pressure
The force exerted per unit area on a surface.
Force
An interaction that causes an object to change its velocity, measured in newtons (N).
Pressure
The force exerted per unit area on a surface.
Force
An interaction that causes an object to change its velocity, measured in newtons.
Pressure
The force exerted per unit area on a surface, measured in pascals (Pa).
Force
An interaction that causes an object to change its velocity, measured in newtons (N).
Pressure
The force exerted per unit area on a surface.
Force
An interaction that causes an object to change its velocity, measured in newtons.
Pressure
The force exerted per unit area on a surface.
Area
The measure of the surface over which a force is distributed, typically measured in square meters.
Pressure
Pressure is defined as the force applied per unit area.
Pascal
Pascal is the SI unit of pressure, equivalent to one newton per square meter.
Pressure
The force exerted per unit area on a surface.
Force
An interaction that causes an object to change its velocity, measured in newtons.
Pressure
The force exerted per unit area on a surface.
Force
An interaction that causes an object to change its velocity, measured in newtons.
Pressure
The force exerted per unit area on a surface, measured in pascals (Pa).
Upthrust
The upward force exerted by a fluid on an object submerged in it, counteracting the weight of the object.
Pressure
The force exerted per unit area on a surface, measured in pascals (Pa).
Force
A push or pull acting on an object, measured in newtons (N).
Pressure
The force exerted per unit area on a surface, measured in pascals (Pa).
Depth
The vertical distance below the surface of a liquid, measured in metres (m).
Pressure
The force exerted per unit area on a surface, measured in pascals (Pa).
Hydrostatic Pressure
The pressure exerted by a fluid at equilibrium due to the weight of the fluid above it.
Pressure
The force exerted per unit area on a surface.
Liquid Pressure
The pressure exerted by a liquid at a given depth, caused by the weight of the liquid above.
Pressure
The force exerted per unit area on a surface.
Gravitational Field Strength
The force per unit mass experienced by a small test mass placed in a gravitational field, measured in N/kg.
Pressure
The force exerted per unit area on a surface, measured in pascals (Pa).
Gravitational Field Strength
The force per unit mass experienced by an object in a gravitational field, measured in newtons per kilogram (N/kg).
Pressure
The force exerted per unit area on a surface, measured in pascals (Pa).
Depth
The distance below a reference point, often used in relation to pressure in fluids.
density
The mass per unit volume of a substance, measured in kilograms per metre cubed (kg/m³).
depth
The distance measured downwards from a surface, typically measured in metres (m).
pressure difference
The difference in pressure between two points in a fluid, which can result in a force acting on an object.
upthrust
The upward force exerted by a fluid on a submerged object, caused by pressure differences.
Upthrust
The upward force exerted by a fluid on a submerged object, equal to the weight of the fluid displaced.
Buoyant Force
The net upward force on an object in a fluid, resulting from the difference between the fluid’s weight above and below the object.
upthrust
The upward force exerted by a fluid on a submerged object, counteracting the weight of the object.
floating
The condition of an object remaining on the surface of a fluid due to the balance between its weight and the upthrust acting on it.
Pressure
The force exerted per unit area on a surface, measured in pascals (Pa).
Upthrust
The upward force exerted by a fluid on a submerged object, counteracting the weight of the object.
atmospheric pressure
The pressure exerted by the weight of air particles colliding with surfaces.
air particles
Small particles that make up the air and contribute to atmospheric pressure through collisions.
atmospheric pressure
Pressure caused by air particles colliding with surfaces.
density
Mass per unit volume of a substance, typically measured in kilograms per cubic meter (kg/m³).
atmospheric pressure
The pressure exerted by the weight of air particles colliding with surfaces.
height above Earth's surface
The vertical distance from the Earth's surface to a given point in the atmosphere.
atmospheric pressure
The pressure exerted by the weight of air above a surface.
weight of air
The force due to gravity acting on the mass of air above a surface.
pressure difference
The difference in pressure between two points in a fluid, which can result in a force acting on an object.
force in gases
The force exerted by gas particles colliding with surfaces, influenced by pressure differences.
atmospheric pressure
The pressure exerted by the weight of air particles colliding with surfaces.
pressure difference
The variation in pressure between two points in a fluid or gas, which can produce forces.
Atmospheric Pressure
The pressure exerted by the weight of air above a surface, caused by air particles colliding with that surface.
Liquid Pressure
The pressure exerted by a liquid at a given depth, which increases with depth due to the weight of the liquid above.
air pressure
The pressure exerted by air particles colliding with surfaces.
atmospheric pressure
The pressure caused by the weight of air above a surface.
atmospheric pressure
The pressure exerted by the weight of air particles colliding with surfaces.
collision
The interaction between air particles and surfaces that results in the exertion of pressure.
atmospheric pressure
The pressure exerted by the weight of air particles colliding with surfaces.
altitude
The height above a reference point, typically sea level, affecting atmospheric pressure.
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