absorptance,
absorption coefficient,
coefficient of absorption a measure of the rate of decrease in the intensity of electromagnetic radiation (as light) as it passes through a given substance; the fraction of incident radiant energy absorbed per unit mass or thickness of an absorber; "absorptance equals 1 minus transmittance"
coefficient of drag,
drag coefficient the ratio of the drag on a body moving through air to the product of the velocity and the surface area of the body
coefficient of friction the ratio of the weight of an object being moved along a surface and the force that maintains contact between the object and the surface
coefficient of mutual induction,
mutual inductance a measure of the induction between two circuits; the ratio of the electromotive force in a circuit to the corresponding change of current in a neighboring circuit; usually measured in henries
coefficient of self induction,
self-inductance the ratio of the electromotive force produced in a circuit by self-induction to the rate of change of current producing it, expressed in henries
modulus (physics) a coefficient that expresses how much of a specified property is possessed by a specified substance
A coefficient is a multiplicative factor in some term of an expression (or of a series); it is usually a number, but in any case does not involve any variables of the expression. For instance in the first three terms respectively have coefficients 7, −3, and 1.5 (in the third term there are no variables, so the coefficient is the term itself; it is called the constant term or constant coefficient of this expression). The final term does not have any explicitly written coefficient, but is usually considered to have coefficient 1, since multiplying by that factor would not change the term.
