This document discusses key principles relating to fluids and their properties: - Archimedes' Principle explains how buoyancy allows objects to float if the fluid displaced weighs more than the object. - Density measures the mass per unit volume of a substance. - Pascal's Principle describes how pressure is transmitted equally in all directions throughout a fluid. - Bernoulli's Principle relates the pressure of a fluid to its velocity. As velocity increases, pressure decreases. - Boyle's Law states that as a gas is compressed into a smaller space, its pressure increases.