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There are many times that mathematical equations used in one area of engineering turn out to represent problems in another area equally well. You just have to change the units. This is particulalry true of flows, whether they be flows of electrons, water or energy.
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Thanks. You learn something everyday.  My physics teacher told me about this also. You can use fluid dynamic equations and use in air problems. You just change the constants.
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If either a public officer or any one else saw a person attempting to cross a bridge which had been ascertained to be unsafe, and there were no time to warn him of his danger, they might seize him and turn him back without any real infringement of his liberty; for liberty consists in doing what one desires, and he does not desire to fall into the river. -Mill
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