Determine the specific weight of air when the temperature is 100∘f and the absolute pressure is 60 psi . the gas constant for the air is r = 1716 ft⋅lb/[slug⋅r]. express your answer using three significant figures.

so specific weight is 009 lb-f/ft³

Explanation:

given data

temperature = 100°F = 559.67°R

absolute pressure = 60 psi = 8640 lb/ft²

gas constant for the air R = 1716 ft⋅lb/[slug⋅R]

to find out

specific weight of air

solution

we know specific weight is express as

specific weight =  

specific weight =              ...........1

m is mass and v is volume and g is acceleration due to gravity = 32.174 ft/s²

and by ideal gas equation

Pv = nRT

so specific weight

specific weight =

specific weight = 0.2894472 slug/ft²-s²

specific weight = 9.312677 lbm/ft²-s²

so specific weight is 009 lb-f/ft³

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explanation: