# PHYSICS 102E

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1. A glass flask whose volume is exactly 1000cm^3 at 0 degrees Celsius is completely filled with mercury at this temperature. When the flask and mercury are heated to 100 degrees Celsius, 15.2cm^3 of mercury overflow. If the coefficient of volume expansion of mercury is 18 x 10^-5 per Celsius degree, compute the coefficient volume expansion of the glass.

thanks.

• PHYSICS 102E -

The increase in volume of the mercury MINUS the increase in the flask is the overflow. The flask volume expansion is
delta Vf = V *(alphag) * delta T

Voverflow = deltaVm - deltaVg

Use that relationship and the calculated expansion of the mercury volume, delta Vm, to solve for alphag, the coefficient of thermal expansion of the glass.

• PHYSICS 102E -

thanks

• PHYSICS 102E -

I can't the answer. I don't understand. the answer in the book is 2.8 x 10^-5 per degree Celsius.

• PHYSICS 102E -

15.2 = 1000 * (alpham-alphag)* 100
alpham - alphag = 15.2*10^-5
alphag = 18*10^-5 - 15.2*10^05 = 2.8*10^-5

• PHYSICS 102E -

wow thanks. it made my mind clear. thank you. :)

• PHYSICS 102E -

3.14*10^-4

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