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Your student is right : wind is air in motion, and you can tap thearea * speed * density of air ( = 1.3 Kg/cubic meter)
kinetic energy of the air with a windmill.
If you consider one square meter of vertical area normal to the wind,
the amount of mass traversing it is:
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comparable to the solar constant at sea level ( = 1 KW/m^2), but of
course the transformation into usable form is different in both cases.
Jean OOSTENS