Excerpt:
1729: Leonhard Euler (1707-1783), extending Johann Bernoulli's work on Descartes' vortex cosmology, models air with tightly-spaced, spinning spheres. He formulate an equation of state relating humidity, pressure, density and velocity, finding the Townley-Power-Boyle law as an approximation. He calculates air molecules to be about 477 m/s at mean conditions, and that this is about the speed of sound.
Annotation:
This is a timeline of the history of statistical mechanics and thermodynamics