Fluids

Archimedes principle

The buoyant force on an object is equal to the weight of fluid it displaces. Archimedes' principle. This principle explains why objects float or sink in a fluid based on the weight of the fluid they push aside.

Atmospheric pressure

The pressure caused by the weight of the atmosphere. Atmospheric pressure. It is the force exerted by the air's weight on everything at Earth's surface.

Bernoullis principle

When a fluid's speed increases, its pressure decreases, like with air or water. Bernoulli's principle. This principle explains that in a flowing fluid, an increase in speed results in a decrease in pressure.

Buoyant force

The upward force exerted on an object immersed in a fluid. Buoyant force. Buoyant force is the lift that makes objects in water float by pushing them upwards.

Density

An object's mass per unit volume. Density. Density is how much stuff is packed into a certain amount of space.

Fluid

A material that can flow and take the shape of its container. Fluid. A fluid is any substance, like a liquid or gas, that can flow and easily change shape.

Lift

An upward force on an object due to differences in pressure. Lift. Lift is the force that enables airplanes to rise into the air and stay aloft by creating a pressure difference above and below their wings.

Pascals principle

The pressure increase in a confined fluid is transmitted equally to all parts of the fluid. Pascal's principle states that when pressure is applied to a fluid in a closed system, it is distributed evenly throughout the fluid.

Pressure

Force exerted per unit area. Pressure. In Science, pressure is the amount of force applied on a surface divided by the area over which it is distributed.