Reklama

The equation of heat balance during melting and crystallization.

Many calculations of heat transfer processes, in which melting and curing, carried out using the heat balance equation. As an example, consider, how is this equation in determining the specific heat of fusion of ice using a calorimeter.

Take a calorimeter of mass mK, in which is some water mB at temperature T1. To determine λ ice, throw in the calorimeter a piece of melting ice of mass mL at a temperature TPL. Suppose, what, when all the ice has melted, the calorimeter was installed the temperature Ɵ. Then you can count, that ice received heat, when melted, and formed from water — when heated to a temperature Ɵ, t. e.

IMG_20140725_00021_cr

Gave the heat the calorimeter and water were in it. So

QGET=QThe DEPARTMENT, have

From the last equation results, derived from experience, calculate the specific heat of fusion of ice. It is equal to λL=3,3*106 J/kg.

Reklama