Question

ice on a car windscreen will disappear as you drive along even without the heater on explain why this happen

Answer 1

Answer:

The phenomenon you are observing is called sublimation, which is the change from a solid state to a gas state without passing through a liquid state.

Let's say the temperature of the ice is 0 degrees C. This means the average temperature of all the molecules in the ice is at that temperature. However, the actual temperature of any individual molecule can be greater or less than the average. That means that some of the molecules are moving faster, and others slower, than the average.

Occasionally, some of the water molecules leave the surface of the ice on the windshield and are blown away by the moving wind. Since there is no way to supply more water molecules to the ice, it gradually gets smaller and smaller until it disappears.

Of course, a sunny day will make the process go faster as more molecules absorb energy from the sun and are able to escape their icy prison.

This same thing happens to comets as they get closer to the sun. See the link for more information.

Explanation:

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