Physical quantities

fraction of electrical current carried by given ionic species

intensive quantity, heat capacity per amount of substance

parameter in the gravitational two-body problem

comparison of a wide range of speeds

mass fraction in a saturated mixture that is vapor

complex measure of the attenuation (real part) and phase angle (imaginary part) along the path travelled by a plane wave

rate of transfer of energy through a surface

measure of the pulling power of a watercraft

measure for the exponential reduction of a quantity along a path due to absorption and scattering

perpendicular impacts at the CoP will produce no reactive shock at the pivot of a rigid beam

time derivative of the sound particle displacement

angular momentum deriving from photon spin

power per area

In physics and engineering, permeation (also called imbuing) is the penetration of a permeate (a fluid such as a liquid, gas, or vapor) through a solid. It is directly related to the concentration gradient of the permeate, a material's intrinsic permeability, and the materials' mass diffusivity. Permeation is modeled by equations such as Fick's laws of diffusion, and can be measured using tools such as a minipermeameter.

form of thermal efficiency

a measure of a substance's tendency towards ionic conduction

dimensionless quantity related to porosity

ability of a material to exchange thermal energy with surroundings

external mechanical resistance against which a machine acts

non-classical state of matter

in materials engineering, the ratio of stress to strain under vibratory conditions

Immittance is a term used within electrical engineering and acoustics, specifically bioacoustics and the inner ear, to describe the combined measure of electrical or acoustic admittance and electrical or acoustic impedance. Immittance was initially coined by H. W. Bode in 1945, and was first used to describe the electrical admittance or impedance of either a nodal or a mesh network. Bode also suggested the name "adpedence", however the current name was more widely adopted. In bioacoustics, immittance is typically used to help define the characteristics of noise reverberation within t

mechanical property that characterizes a polymer

scalar potential used in fluid dynamics

mathematical approach to the description of the deformation of a solid body in which the displacements of the material particles are assumed to be much smaller than any relevant dimension of the body

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measurement of pressure exerted on the ground, often used for the pressure from an offroad vehicle's wheels or tracks

physical quantity in radiometry

Electrical elastance is the reciprocal of capacitance. The SI unit of elastance is the inverse farad (F−1). The concept is not widely used by electrical and electronic engineers, as the value of capacitors is typically specified in units of capacitance rather than inverse capacitance. However, elastance is used in theoretical work in network analysis and has some niche applications, particularly at microwave frequencies.

property of water-soluble substances

quantized unit of electrical conductance

quantum mechanical statistic

any measure of hardness based on indentation resistance

physical quantity

thumb|The "energy flash" of a hypervelocity impact during a laboratory simulation of what happens when a piece of orbital debris hits a spacecraft in orbit thumb|The aftermath of a hypervelocity impact, with a projectile the same size as the one that impacted for scale

power per unit area per unit wavelength of a wavelength concentration, important for a substance's transmittance, reflectivity, and absorbance

time-averaged sound energy in a volume

astronomical concept

instantaneous displacement of a particle from its equilibrium position in a medium as it transmits a sound wave

amount of power radiated through a given area

portion of a system's entropy that is related to discrete representative positions of its constituent particles

unit of nuclear and particle physics

The carcel is a former French unit for measuring the intensity of light. The unit was defined in 1860 as the intensity of a Carcel lamp with standard burner and chimney dimensions, which burnt colza oil (obtained from the seed of the plant Brassica campestris) at a rate of 42 grams of colza oil per hour with a flame 40 millimeters in height.

quotient of the linear photon attenuation coefficient and the mass density