Question

Though it is summer or winter, the ice on glaciers doesn't melt completely due to what?

• A. Because every gram of Ice requires 336 J of heat energy to melt
• B. Because every gram of Ice requires less heat energy
• C. Because there is no water on glaciers
• D. None

Answer 1

Answer: (A)

Because every gram of Ice requires 336 J of heat energy to melt

Heat gained by the unit mass of a substance to convert itself from solid to liquid state is called latent heat of melting . The latent heat of melting of ice is $80cal.g^{-1}$ or $80\times 4.2=336J$ , therefore each 1 gram of ice requires 336J of heat to melt , this much heat is not available to the large mass of ice on glaciers even in summer so ice doesn't melt completely in summer or winter .