There is 1 kg of water at a temperature of 0 ° C and a kg of ice at a temperature of 0 ° C. Is the same internal

| September 7, 2021 | education

There is 1 kg of water at a temperature of 0 ° C and a kg of ice at a temperature of 0 ° C. Is the same internal energy in these bodies? In which is more? How much?

The internal energy E is the sum of the kinetic energy of motion Ek and the potential energy of interaction En of all molecules E = Ek + En. Since they have the same temperature, and temperature is a measure of the average kinetic energy of translational motion Ek = 3 * k * t / 2, then the kinetic energy of 1 kg of water and ice is the same. The potential interaction energy for these substances is different, since they are different aggregate states. In order to melt 1 kg of ice and turn it into water, 330 * 10 ^ 3 J (specific heat of fusion) of thermal energy is required. Already 1 kg of water obtained from ice will have 330 * 10 ^ 3 J of internal energy more.
Answer: 1 kg of water at t = 0 “C has an internal energy of 330 * 10 ^ 3 J more than 1 kg of ice at t = 0” C.



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