kinetic theory

noun

Definition of kinetic theory

: either of two theories in physics based on the fact that the minute particles of a substance are in vigorous motion:
a : a theory that the temperature of a substance increases with an increase in either the average kinetic energy of the particles or the average potential energy of separation (as in fusion) of the particles or in both when heat is added

called also kinetic theory of heat

b : a theory that the particles of a gas move in straight lines with high average velocity, continually encounter one another and thus change their individual velocities and directions, and cause pressure by their impact against the walls of a container

called also kinetic theory of gases

First Known Use of kinetic theory

1864, in the meaning defined above

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The first known use of kinetic theory was in 1864

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Cite this Entry

“Kinetic theory.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/kinetic%20theory. Accessed 26 January 2020.

More from Merriam-Webster on kinetic theory

Britannica.com: Encyclopedia article about kinetic theory

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