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Back to the electric fan...
There was a pretty good article in Car Craft Magazine recently on junk yard electric radiator fan conversions.
Electric Radiator Fans - Car Craft Magazine
(throws on lab coat)
You're right, air is also a gas (under standard temperature and pressure).
Wikipedia puts it well:
"...a fluid is a substance that continually deforms (flows) under an applied shear stress. Fluids are a subset of the phases of matter and include liquids, gases...
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