The density of air or atmospheric density, denoted ρ, is the mass per unit volume of Earth's atmosphere. Air density, like air pressure, decreases with...

or 39.2 °F); for gases, the reference is air at room temperature (20 °C or 68 °F). The term "relative density" (abbreviated r.d. or RD) is preferred in...

fuels where in practice air would only be drawn in locally to the burner. This explains the apparently lower energy density of materials that contain...

electromagnetism, current density is the amount of charge per unit time that flows through a unit area of a chosen cross section. The current density vector is defined...

vector fields denoted by the symbols B and H. In the International System of Units, the unit of B, magnetic flux density, is the tesla (in SI base units:...

barometric formula is a formula used to model how the pressure (or density) of the air changes with altitude. There are two equations for computing pressure...

The area density (also known as areal density, surface density, superficial density, areic density, mass thickness, column density, or density thickness)...

Dual Air Density Explorer was a set of 2 satellites, DADE-A and DADE-B, released as part of NASA's Explorer program. DADE-A and DADE-B was launched on...

Density functional theory (DFT) is a computational quantum mechanical modelling method used in physics, chemistry and materials science to investigate...

speed of sound increases with density. This notion is illustrated by presenting data for three materials, such as air, water, and steel and noting that...