Carnot efficiency for radiation fluids with new entropy definition and measure

Radiation has momentum and on reflection from confining surfaces exerts a pressure due to momentum reversal. Radiation is also a quanta of energy given by Plank’s formula E=hf. We show that it is possible using these results to calculate a Carnot efficiency for a process in which the hot and cold surfaces are both in the form of radiation. We then connect this with the general formula for entropy and give a new definition for entropy as a measure of uniformity rather than chaos. This allows a statistical variance to be used as a measure for entropy. We show that this goes in line with the basic definition of thermodynamic entropy, which is found to be in essence a ‘non-dimensional’ quantity describing the ‘energy distribution’ or the configuration state of energy in a system. The dimensions normally given to entropy are not an essential part of it- it is an imposed thing. A connection between entropy and gravity is found next, showing that gravity is a source of negative entropy, with big stars and blackholes acting as stores of low entropy radiation and matter.