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In kinetic theory of gases, the mean free path is the average distance traveled by a molecule, or a number of molecules per volume, before they make their first collision. Let σ {\displaystyle \sigma } be the collision cross section of one molecule colliding with another.
His book, The Kinetic Theory of Gases (London, 1934), contains the main results of his research. Knudsen was also very active in physical oceanography, developing methods of defining properties of seawater. He participated as hydrographer on the Ingolf expedition in the North Atlantic in 1895-96.
In physics, mean free path is the average distance over which a moving particle (such as an atom, a molecule, or a photon) travels before substantially changing its direction or energy (or, in a specific context, other properties), typically as a result of one or more successive collisions with other particles.
Much of his research for the Navy focussed on hydrodynamics and elasticity, in particular on the theory of potential flow, the physics of underwater explosions and structural vibrations. In 2018, more than 90 years after its prediction by Kennard, the first experimental observation of Kennard phase was achieved by a collaboration of researchers ...
Boltzmann's kinetic theory of gases was one of the first attempts to explain macroscopic properties, such as pressure and temperature, in terms of the behaviour of individual atoms and molecules. Although many chemists were already accepting the existence of atoms and molecules, the broader physics community took some time to embrace this view.
Building on his theory of the mechanical explanation of gravity, he was the first to develop the kinetic theory, independently of earlier and equally neglected partial accounts by Daniel Bernoulli and John Herapath. He published it, at his own expense, in his book Thoughts on the Mental Functions (1843).
His work on the history of thermodynamics began with a series of essays in Annals of Science (1957/1958) on the kinetic theory of gases. In this work he brought attention to forgotten precursors of kinetic theory like John Herapath and John James Waterston, who formulated the law of equal distribution in 1845 rejected by the Royal Society.
Gas kinetics is a science in the branch of fluid dynamics, concerned with the study of motion of gases and its effects on physical systems.Based on the principles of fluid mechanics and thermodynamics, gas dynamics arises from the studies of gas flows in transonic and supersonic flights.