Thanks (Adrian Seng) one of our great Fans :) Increase in temperature has opposite effect on liquids and gasses. At high temperature, viscosity of liquid decreases. This is because when liquids get heated, the intermolecular forces and cohesive force between molecules become weaker. Hence, the average speed of the molecules in a liquid increases and hence the amount of time they spend "in contact" with their nearest neighbors decreases when they get heated. However, viscosity of gasses increases at high temperatures. This is due to the high kinetic energy posed by the gas molecules when heat is supplied. Therefore, gas molecules collide more frequently with each other under this circumstances. Since most of the time the molecules in a gas are moving freely through the voids, anything that increases the number of times one molecule in contact with another will decrease the ability of the molecules as a whole to engage in the coordinated movement. The more the frequent the molecular collisions, the more disorganized their motion becomes. physics.info/viscosity/
Posted on: Tue, 10 Sep 2013 09:01:39 +0000
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