Specific Weight, $\gamma$

Specific Weight, $\gamma$ of a fluid is defined as the weight per unit volume and is related to density.

$$\gamma = \rho g$$ (1.15)

where g is acceleration due to gravity. Its units (in SI units) are $N/m^3$. Noting that the value of g is $9.807 m/s^2$ specific weight of water at $60^0 C$ is $9.8 kN/m^3$. For air at $15^0 C$ and atmospheric pressure specific weight is $12.0 N/m^3$.

(c) Aerospace, Mechanical & Mechatronic Engg. 2005
University of Sydney