specific weight

(redirected from Unit weight)

specific weight

[spə′sif·ik ′wāt]
(mechanics)
The weight per unit volume of a substance.

Specific Weight

 

the ratio of a body’s weight P to its volume V—that is, the quantity γ = P/V. Specific weight can also be determined from the formula γ = pg, where p is the density of a substance and g is the acceleration of free fall. Unlike density, the specific weight is not a physical or chemical characteristic of the substance, because it is a function of the value g at the location of measurement. The units used for specific weight are new-tons per cu m in the International System of Units (SI), dynes per cu cm in the cgs system, and kilograms force per cu m in the mks system (1 N/m3 = 0.1 dyne/cm3 = 0.102 kgf/m3).

specific weight

i. The ratio of the weight of an aircraft's reciprocating engine (including the weight of the cowling and the propeller) to the brake horsepower it produces.
ii. The ratio of the mass of a gas turbine engine and its net thrust.
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