Let’s say (not real math) that 99 mph wind cannot pick up a car, but 100 mph can. Is there a unit of strength? Or calculation for the speed vs what it can do?
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You would measure force. If you have a gas at a certain density, moving at a certain speed, it will apply a certain force to a fixed object. The larger the surface area of the object (let’s assume a flat rectangle perpendicular to the wind), the greater the force it has to endure. Pressure remains constant, but load bearing capacity has to increase with surface area.
Point a blow dryer at a bathroom scale, it will exert a force, it just won’t be large enough to register. If you had a very sensitive bathroom scale, it would.
So if you assume a uniform density, you can gauge the forces a given wind speed will apply to a given object.
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