Increasing this measure for a substance will increase the permeability of a fluid moving past the substance.
The Kozeny-Carman equation is a model that links this property to estimate a related property calculated by Valenta's law. This property can be measured through the amount of imbibition carried out by processes such as capillary action. This property is inversely proportional to the specific yield, which is sometimes known as its effective type. It is directly proportional to the amount of specific retention. This is one of the parameters in Darcy's law, which describes media with non-zero values for it. Increasing this measure for a substance will increase the permeability of a fluid moving past the substance. This quantity, symbolized phi, decreases with grain size. For 10 points, name this quantity describing the amount of openings or spaces in a material.
The Kozeny-Carman equation is a model that links this property to estimate a related property calculated by Valenta's law.
porosity [or void ratio; accept word forms]