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Small wind currents in the classroom can be deduced by noting
that heated air rises and, therefore, makes a small current
of air - that is wind.

If temperature readings are taken in different places in the
room (e.g., at the ceiling and the floor, at the bottom and
top of an open window), you will see that the movement
corresponds to the exchange of warm and cool air.

Does the window or door have to be open in order that there
be an air current?

Warm air weighs less than cold air and exerts less pressure -
- thus it creates an area of low pressure. The heavier cold
air creates an area of high pressure and pushes the warm air

If cold air pushes warm air upward, why do they build our
houses with forced air heating coming out of the walls close
to the ceilings?

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