A glass flask whose volume is 1000cm3 at a temperature of 0.100?C is completely filled with mercury at the same temperature. When the flask and mercury are warmed together to a temperature of 52.0?C , a volume of 8.00cm3of mercury overflows the flask.
If the coefficient of volume expansion of mercury is ?Hg = 1.80
Original volume of mercury = 1000 cm3.
The final volume of mercury considering its volume expansion
quotient = 1000 + 1000*(1.8*10^-4 *51.5) = 1000 + 9.27 = 1009.27
cm^3
Considering the glass as a non expanding substance, the complete
excess volume of 9.27 cm3 of mercury should have overflown the
container, but due to the expansion of glass, the capacity of
mercury containment increases and so a lesser amount of mercury
flows out.
The amount of mercury that actually flowed out = 8 cm3.
So, the expansion of the glass container = 9.27-8 = 1.27 cm3.
Using the formula for coefficient of expansion,
coefficient of volume expansion of glass = 1.27/(1000 * 51.9) =
2.447 * 10^-5 per degree
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