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Unit weight, also called specific weight, is a physical quantity similar to density, except that it is weight (mass times gravity) divided by volume rather than mass divided by volume. This is also density times gravity.
The terms density and unit weight are used interchangeably in soil mechanics. Though not critical, it is important that we know it. To find the formula for density, divide the formula of unit weight by gravitational constant g (acceleration due to gravity).
The specific weight, also known as the unit weight (symbol γ, the Greek letter gamma), is a volume-specific quantity defined as the weight W divided by the volume V of a material: = / Equivalently, it may also be formulated as the product of density, ρ, and gravity acceleration, g: = Its unit of measurement in the International System of ...
The SI unit of specific weight is Newton per cubic meter (N/m 3). The US customary unit of specific weight is pounds-force per cubic foot (lbf/ft 3 ). Specific Weight Example
Unit weight or density is used to quantify the weight per unit volume of an object. When it is expressed in the basic SI Unit of mass (kg/m 3), it is usually referred to as density, but when expressed in terms of weight (kN/m 3), it is usually referred to as unit weight. Density (kg/m 3) = Mass (kg)/Volume (m 3)
Dry unit weight is typically expressed in kilograms per cubic meter (kg/m³) or pounds per cubic foot (lb/ft³). The calculation of dry unit weight is similar to that of dry density. It involves dividing the weight of the solid particles by the total volume of the material, including the void spaces.
The weight of an object is defined as the force of gravity on the object and may be calculated as the mass times the acceleration of gravity, w = mg. Since the weight is a force, its SI unit is the newton.