Scientists have abandoned experimental proof of η=1-T1/T2 and instead used experimental data to piece together η=1-T1/T2. Shameful! Please refer to the attached diagram for details:
1) Method A in the figure is a method for verifying Carnot efficiency, which scientists rarely use because the experiment deviates significantly from theoretical predictions.
2) Scientists extensively use method B in the figure, which does not involve theoretical predictions, but instead uses experiments to gather theory. This is shameful, it's data fraud. The enthalpy entropy charts we use are all pieced together using method B.
3) Scientists explain why method A is not necessary. It's because the experiment is not good, which is deceiving. Science has developed for hundreds of years, and even more rare experiments can be conducted.
4) The core is that scientists are unwilling to admit that the second law of thermodynamics is inconsistent with experiments, but this violates scientific discipline and morality.