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29 November, 19:04

A volume of 20 cu ft of air at a pressure of 50 psig is heated and expanded to 30 cu ft and 40 psig. Find the change in the energy of air in joules.

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  1. 29 November, 19:22
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    39,047.6 Joules

    Explanation:

    Step 1: identify the given parameters

    Initial Volume of gas (V₁) = 20 Ft³

    Final Volume of Gas (V₂) = 30 Ft³

    Initial Pressure of Gas (P₁) = 50 psig

    Final Pressure of Gas (P₂) = 40 psig

    Step 2: Calculate Energy change of the gas

    E = ΔPV

    E = P₂V₂ - P₁V₁

    E = (40*30) - (50*20)

    E = 1200 - 1000

    E = 200 Ft³. Psig

    Convert to Joules

    1 Ft³. Psig = 195.238

    200 Ft³. Psig = ?

    = 39,047.6 Joules
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