"We show that it is natural to introduce the concept of black-hole entropy as the measure of information about a black-hole interior which is inaccessible to an exterior observer. Considerations of simplicity and consistency, and dimensional arguments indicate that the black-hole entropy is equal to the ratio of the black-hole area to the square of the Planck length times a dimensionless constant of order unity. A different approach making use of the specific properties of Kerr black holes and of concepts from information theory leads to the same conclusion, and suggests a definite value for the constant."
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Jacob Bekenstein, Abstract, "Black Holes and Entropy" D (Apr 15, 1973) Vol. 7, Issue 8, p. 2333.
https://en.wikiquote.org/wiki/Entropy_(thermodynamics)
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Entropy (thermodynamics)
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