Discussion
Which quantity does specific volume denote?
Answer: B
Specific volume, denoted alpha, is the reciprocal of density and appears in the first law as the coefficient of the pressure change. Using it rather than density keeps the thermodynamic equations in a per unit mass form throughout, which is convenient when following a parcel. Its value at sea level is about 0.82 cubic metres per kilogram, the reciprocal of the familiar 1.225 kilograms per cubic metre. Keeping the two reciprocals straight is worth a moment's care when substituting into a formula.
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