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Heat

Ice cubes put...

Question

Ice cubes put in a thermocol box do not melt fast. Why?

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Solution

Thermocol box is a bad conductor of heat so it does not allow the entry of heat from the walls of thermocol box from surrounding to the box in which ice cubes are kept. So ice cube store in a thermocol box remains in the solid state for a long time. Thermocol box acts as an insulator.

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When Ice Cubes are kept inside a thermocol box

It does not melt fast. Why??

Heat chapter is not showing. But my question is related to states of matter. Why are ice cubes kept in thermocol boxes?

Q. A cubical thermocole ice box of side

20 c m

has a thickness

5 c m

5 k g

of ice is put in the box, the amount of ice remaining after

10 h o u r s

is
(The outside temperature is

50

and the coefficient of thermal conductivity of thermocole

= 0.01 J s^{- 1} m^{- 1}^{- 1}

, latent heat of fusion of ice

= 335 \times 10^{3} J {k g}^{- 1})

Q. Deepak put twenty ice cubes of the same volume into four containers packed inside different materials. He recorded the time taken for the ice to melt in each case. The table shows his results. Which of the boxes should he choose to carry ice that he needs to take to a friend's house 120 km away?
Deepak's Observations

Packing Material	Melting
a. thermocol	3 h 10 min
b. paper	2 h 05 min
c. sand	30 min
d. sawdust	1 h 15 min

2 c m \times 2 c m \times 2 c m

cubes of ice are taken out from a refrigerator and are put in 200 ml of a drink at

10^{\circ} C

.
(a) Find the temperature of the drink when thermal equilibrium is attained in it.
(b) If the ice cubs do not do not melt completely, find the amount melted. Assume that no heat is lost to the outside of the capacity. Density of ice

= 900 k g / m^{3}

, density of the drink

= 1000 k g / m^{3}

, specific heat capacity of the drink 4200 J/kg-K, latent heat of fusion of ice

3.4 \times 10^{5} J / k g .

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