Abstract

Pictet’s experiment was front and center in the 18th/19th century debate concerning whether heat is a wave, or a particle. Pictet’s experiment is best understood by realizing that thermal radiation energy plays a significant role in heat transfer. It is argued that this readily ignored experiment should have long ago alerted us to issues concerning our understanding of thermodynamics. This questions the rationale behind modern statistical thermodynamics, which describes all of a gaseous system’s energy purely in terms of the kinematics of that system’s gas. Not only is the philosophy of statistical mechanics now questioned but so too are those associated with entropy and its mathematical accomplice the second law. After raising questions, a simpler explanation as to what is witnessed will be discussed. An explanation that relegates statistical mechanics to a valid approximation for sufficiently dilute closed systems of gas, such as those often used in experiments. An explanation that remains void of the mathematical simplifications that statistical mechanics provides. Ultimately, the accepted epistemology of our sciences will be verbally challenged.