explain cooling on the basis of molecular structure?

Answer 1

Cooling is the slowing down of molecular movement.

Answer 2

This is probably due to the fact that all molecules are always moving, vibrating, pulsating depending on their state. In liquids this is known as brownian movement.

(Brownian motion
In 1827 the English botanist Robert Brown noticed that pollen grains suspended in water jiggled about under the lens of the microscope, following a zigzag path like the one pictured below. (Click the mouse button to draw a new path). Even more remarkable was the fact that pollen grains that had been stored for a century moved in the same way.
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BrownianMotion.java | CGraphics.java

In 1889 G.L. Gouy found that the "Brownian" movement was more rapid for smaller particles (we do not notice Brownian movement of cars, bricks, or people). In 1900 F.M. Exner undertook the first quantitative studies, measuring how the motion depended on temperature and particle size.

The first good explanation of Brownian movement was advanced by Desaulx in 1877: "In my way of thinking the phenomenon is a result of thermal molecular motion in the liquid environment (of the particles)." This is indeed the case. A suspended particle is constantly and randomly bombarded from all sides by molecules of the liquid. If the particle is very small, the hits it takes from one side will be stronger than the bumps from other side, causing it to jump. These small random jumps are what make up Brownian motion.

References: Encyclopedia Brittanica 1968, "Brownian Movement." )


Increase of this vibrations elevates the temperature. This principle is used in our "Microwave Ovens" for cooking food. This if one manages to reduce these vibrations then the substance will cool.

Answer 3

when something cools it slows down. ie it slows it's vibrations, rotations, etc.

Answer 4

if the molecules dont vibrate or decrease in intensity of vibration...there is coolng