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Earth's atmosphere is a layer of gases that surround it, permitting life and protecting life by absorbing ultraviolet solar radiation, warming the surface by retaining the heat and mitigating the temperature difference between day and night.
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How to calculate air velocity in a fan?
How to calculate air velocity in a fan and what data should I know ?
So if I have a fan motor, fan blade and a battery, what data should I get from these items ? …