A dimensionless quantity that predicts whether fluid flow will be laminar (smooth) or turbulent.
The Reynolds number (Re) = ฯvD/ฮผ, where ฯ = fluid density, v = velocity, D = characteristic length, ฮผ = dynamic viscosity.
Pipe design, aerodynamics, blood flow analysis, heat exchanger sizing. Higher Re means more energy loss due to friction.
The relationship between voltage, current, and resistance in an electrical circuit: V = I ร R.
A unit of energy equal to using 1,000 watts of power for one hour.
A rotational force that causes an object to rotate around an axis, measured in newton-meters or foot-pounds.
A unit of heat energy equal to the amount needed to raise one pound of water by one degree Fahrenheit.
A material property that measures how well it conducts heat, expressed in watts per meter-kelvin (W/mยทK).
The amount of heat energy required to raise the temperature of one unit mass of a substance by one degree.