density
Measure of the compactness of a substance; it is equal to its mass per unit volume and is measured, for example, in kg per cubic metre or lb per cubic foot. Density is a scalar quantity. The average density D of a mass m occupying a volume V is given by the formula:
In photography, density refers to the degree of opacity of a negative; in electricity, current density is the amount of current passing through a cross-sectional area of a conductor (usually given in amperes per square in or per square cm).
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