What is convection current and its relation to curtains/pelmets?

What is convection current and its relation to curtains/pelmets?

Convection currents are the result of differential heating of air. Lighter (less dense), warm air rises while heavier (more dense) cool air sinks.

The combination of pelmet and curtain eliminates the warm air inside being cooled down by the window (or in other words it stops the convection current). As shown in the diagram below.


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