#### specific gravity of iron ore

· specific gravity of iron ore Solids and Metals Specific Gravity 1) NTP Normal Temperature and Pressure is defined as air at 20 o C ( K, 68°F) and 1 atm ( kN/m2, kPa, psia, 0 psig, 30 in Hg, 760 torr) Since specific gravity is the ratio between the density (mass per unit volume) of the actual gas and the density of air, specific gravity has no dimension.