Key Terms
- absolute pressure
- sum of gauge pressure and atmospheric pressure
- Archimedes’ principle
- buoyant force on an object equals the weight of the fluid it displaces
- Bernoulli’s equation
- equation resulting from applying conservation of energy to an incompressible frictionless fluid: throughout the fluid
- Bernoulli’s principle
- Bernoulli’s equation applied at constant depth:
- buoyant force
- net upward force on any object in any fluid due to the pressure difference at different depths
- density
- mass per unit volume of a substance or object
- flow rate
- abbreviated Q, it is the volume V that flows past a particular point during a time t, or
- fluids
- liquids and gases; a fluid is a state of matter that yields to shearing forces
- gauge pressure
- pressure relative to atmospheric pressure
- hydraulic jack
- simple machine that uses cylinders of different diameters to distribute force
- hydrostatic equilibrium
- state at which water is not flowing, or is static
- ideal fluid
- fluid with negligible viscosity
- laminar flow
- type of fluid flow in which layers do not mix
- Pascal’s principle
- change in pressure applied to an enclosed fluid is transmitted undiminished to all portions of the fluid and to the walls of its container
- Poiseuille’s law
- rate of laminar flow of an incompressible fluid in a tube:
- Poiseuille’s law for resistance
- resistance to laminar flow of an incompressible fluid in a tube:
- pressure
- force per unit area exerted perpendicular to the area over which the force acts
- Reynolds number
- dimensionless parameter that can reveal whether a particular flow is laminar or turbulent
- specific gravity
- ratio of the density of an object to a fluid (usually water)
- turbulence
- fluid flow in which layers mix together via eddies and swirls
- turbulent flow
- type of fluid flow in which layers mix together via eddies and swirls
- viscosity
- measure of the internal friction in a fluid