Pressure and Fluids

Solids – have definite shapes and definite volumes

Liquids – that phase of matter that have a specific volume but take the shape of their container

Gas – has neither a definite volume nor a definite shape

Plasma – consists of a gas that is capable of conducting electricity

Cohesion – the ratio of shear stress to the rate of change of shear strain in a liquid or gas

Pressure – the exertion of force upon a surface by an object or fluid in contact with it

Buoyant force – the upward force any fluid exerts on an object placed in it

Pascal’s Principle – pressure applied to an enclosed fluid is transmitted undiminished to every part of the fluid, as well as to the walls of the container

Archimedes Principle – an object is immersed in a fluid is buoyed up by a force equal to the weight of the fluid displaced by the object