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non-solid state of matter in which the atoms or molecules are free to move past each other in gas or liquid
takes shape of container


amount of force exerted per unit area of a surface

pascal (Pa)

SI unit for pressure

atmospheric pressure

pressure caused by the weight of the atmosphere

Pressure Formula

pressure = force/area

Fluid Pressure

increases as depth increases

Depth Increases

Water pressure increases faster than
atmospheric pressure does
Water is denser than air

Fluids Flow

high pressure areas to low pressure areas

buoyant force

upward force that keeps an object immersed in or floating on liquid

Archimedes Principle

the buoyant force on an object in a fluid is an upward force equal to the weight of the volume of a fluid that the object displaces


less dense than air

Why does an ice cube float in water?

Ice cube is less dense than water


object that is more dense that surrounding fluid


object that is less dense than surrounding fluid

Overall Density of Object

changed by changing the object's shape, mass or volume

Bernoulli's Principle

the principle that states that the fluid pressure DECREASES as the speed of fluid INCREASES


upward force on an object that moves in a fluid
determined by wing size and thrust


pushing or pulling force exerted by the engine of an aircraft or rocket


force parallel to the velocity of the flow,
it opposes the direction of an aircraft
determines the speed of the aircraft

Pascal's Principle

change in pressure in an enclosed fluid is transmitted equally to all parts of fluid

Wing Shape

airplanes to take advantage of Bernoulli's Principle to achieve flight

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