Liquids and Gases
Of the three states of matter - solid, liquid, and gas - both liquids and gases are considered fluid
A liquid is distinguished from a solid in that a liquid flows to fill the bottom of a container until the liquid has a level surface.
An object in a fluid is buoyed up by a force equal to the weight of the fluid displaced
When additional pressure is put on a confined liquiz, the pressure is transmitted equally to all parts of the liquid
The molecules of the gas are not bound together by forces at all, but fly about freely in space
Diffusion is the intermixing of molecules of substances due to random motion of the molecules
Gases are more easily compressed than liquids. But if there is so much empty space between molecules, why is any effort at all required to compress them? Why do they exert pressure?
Archimedes' principle states that an object in a fluid is buoyed up with a force equal to the weight of fluid displaced
A comprehensive review of fluid mechanics, hydrostatic pressure, and gas dynamics