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Ch 5_extra_021312 - KINETIC MOLECULAR THEORY of...

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1 2/13/2012 KINETIC MOLECULAR THEORY of GASES (abbreviated) is a model that tries to explain the properties of ideal gases and speculates about behavior of individual gas particles. This model assumes: gas molecules are small (negligible volume) gas molecules are moving molecules do not attract or repel each other average kinetic energy of gas molecules is temperature dependent regardless of identity Looking into the Kinetic Molecular Theory (applying principles of physics) The kinetic energy associated with the velocity of molecules: KE = (1/2) mass x velocity 2 KE = (1/2) m x u 2 The temperature of matter is a measure of its thermal energy, such that T is proportional to the average KE (velocity ( u ) is proportional to √T). Gas molecules collide with the walls and, on average, simply reverse their momentum in the direction perpendicular to the wall. This gives rise to the pressure (force per unit area) on the wall.
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