160Chapt. 19Thermodynamics I: Temperature, Heat, First LawWhat is, Alex?a) a state variable or function of stateb) temperaturec) pressured) calorice) no such thing019 qmult 00500 1 1 1 easy thinking: linear expansion in fluidsExtra keywords:This question is too wordy.12. Volume expansion coefficients are usually given for liquids (which together with gases constitutefluids) instead of linear expansion coefficients. Linear expansion coefficients (although they canbe specified) arn’t very meaningful theoretically or practically. This is because:a) fluids (simple fluids at least)CANNOTwithstand the tendency of any applied forceto deform them in a way that leaves volume unchanged.Thus, if a fluid expandsthermally, it’s shape will usually change unless, for example, the fluid container scales upISOTROPICALLYwith the same volume expansion coefficient as the water. Therefore,point-to-point distances between specified fluid elements will usuallyNOT SCALE UPuniformly.
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