Specific gravity is the ratio of the density of a substance compared to the density (mass of the same unit volume) of a reference substance. Apparent specific gravity is the ratio of the weight of a volume of the substance to the weight of an equal volume of the reference substance. The reference substance is nearly always water for liquids or air for gases
what is the specific gravity formula for hydraulic oil?
SG = γ of oil / γ of water
What is the specific weight of water?
SG _{H2O} = 62.4 ^{lb}/_{ft}3
SG _{H2O} = 9800 ^{N}/_{m}3_{}
what is "rho"?
Density
what is the formula for density?
ρ = mass / velocity
ρ = gamma / gravity
what is the value of atmospheric pressure?
14.7 psia
0 psig
what is "mu"?
μ = viscosity.
μ _{abs }= absolute (dynamic) viscosity
what is the unit for absolute (dynamic) viscosity?
μ = pascal-second (Pa·s) (equivalent to N·s/m2, or kg/(m·s))