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Pressure and pressure differences in fluids (physics only) key terms
Study Pressure and pressure differences in fluids (physics only) with curriculum-aligned Key Terms resources, practice links, and exam-focused support.
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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, 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.
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