## Solids and Metals - Specific Gravity

1) NTP - Normal Temperature and Pressure - is defined as air at 20 o C (293.15 K, 68°F) and 1 atm ( 101.325 kN/m2, 101.325 kPa, 14.7 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 …