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Can I apply volume expansion this way? 
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#1
Nov2611, 10:52 PM

P: 1,291

1. The problem statement, all variables and given/known data
An aluminum cup of 120 cm3 capacity is filled with glycerin at 15°C. How much glycerin, if any, will spill out of the cup if the temperature of the cup and glycerin is raised to 34°;C? 2. Relevant equations 3. The attempt at a solution I think I can solve this no problem, but I have a question. Does the capacity of the aluminum cup increase just like aluminum does? IE, would 120 cm3 of aluminum expand just like a 120 cm3 empty space within aluminum? 


#2
Nov2711, 12:55 AM

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P: 10,386

Imagine you fill the empty volume of the cup (120 cm^{3}) with the same aluminium, and say, the volume of the wall is 50 cm^{3}. You have then Vo=Vfilling +Vwall=170 cm^{3} of aluminium altogether which volume will increase by a factor of k=(1+βΔT). So the new volume of the whole piece of aluminium is V=kVo=170k=(120+50)k=120k +50k. (1+βΔT)Vo=(1+βΔT)(Vfilling) +(1+βΔT)(Vwall) The volume of the filling is the same as the volume of the empty place inside the cup, so they increase by the same amount. ehild 


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