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A closed box is filled with dry ice at a temperature of

-87.1 oC, while the outside temperature is 17.6 oC. The box is cubical, measuring 0.332 m on a side, and the thickness of the walls is 4.41 × 10-2 m. In one day, 3.34 × 106 J of heat is conducted through the six walls. Find the thermal conductivity of the material from which the box is made.

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To solve this problem use the formula,
K =
A ( 0 2 - 0, ) t
where, K= Thermal conductivity
8 = Amount
of heat conducted,
A = Area.
Oz = temp outside
D, = temp
t = time
d = thickness

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