In despair, I offer your readers their choice of the following definitions of entropy. My authorities are such books and journals as I have by me at the moment.
{a} Entropy is that portion of the intrinsic energy of a system which cannot be converted into work by even a perfect heat engine.-Clausius.
{b} Entropy is that portion of the intrinsic energy which can be converted into work by a perfect engine.-Maxwell, following Tait.
{c} Entropy is that portion of the intrinsic energy which is not converted into work by our imperfect engines.-Swinburne.
{d} Entropy {in a volume of gas} is that which remains constant when heat neither enters nor leaves the gas.-W. Robinson.
{e} Entropy may be called the 'thermal weight', temperature being called the 'thermal height.'-Ibid.
{f} Entropy is one of the factors of heat, temperature being the other.-Engineering
{a} Entropy is that portion of the intrinsic energy of a system which cannot be converted into work by even a perfect heat engine.-Clausius.
{b} Entropy is that portion of the intrinsic energy which can be converted into work by a perfect engine.-Maxwell, following Tait.
{c} Entropy is that portion of the intrinsic energy which is not converted into work by our imperfect engines.-Swinburne.
{d} Entropy {in a volume of gas} is that which remains constant when heat neither enters nor leaves the gas.-W. Robinson.
{e} Entropy may be called the 'thermal weight', temperature being called the 'thermal height.'-Ibid.
{f} Entropy is one of the factors of heat, temperature being the other.-Engineering
( Sydney Herbert Evershed )
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