Matter and Energy

Matter – a substance that occupies space and mass (exists as solid liquid. or gas)

Mass – the property of matter that responds to gravitational attraction

Weight – is dependant on gravitational attraction

Density – is its mass to volume relationship (density of water is 62.4 lb/ft cubed divided by the standard 62.4 lb/ft cubed = 1 lb/ft cubed) and (red brass' density is 548 lb/ft cubed so it is divided in 62.4 lb/ft cubed = 8.78 lb/ft cubed)

Specific Volume – compares the volume that each pound of gas occupies. Its unit of measure is ft cubed/lb

Specific volume and Density – are inverses of one another V= 1/D and D= 1/V

Specific volume is one of the factors for determining the fan hp in A C systems (low SpV needs high hp and high SpV needs low hp)

Specific volumes of various gases that are prepared is valuable info that enables an engineer to choose the size of the compressor or vapor pump

Specific volumes of vapor are varied by the pressures they are under