Which has more energy: 1 kg of lead, heated to its melting point, but not molten. or 1 kg of molten lead

| April 12, 2021 | education

Which has more energy: 1 kg of lead, heated to its melting point, but not molten. or 1 kg of molten lead at the same temperature?

The internal energy of the body depends on the temperature of the body, its state of aggregation and other external factors.

In order to transfer, at the melting point, 1 kg of lead from a solid state to a liquid, it must be given thermal energy Q equal to the specific heat of melting of lead λ = 25000 J, this energy is used to increase the internal energy.

Specific heat of fusion of lead λ, according to the table of specific heat of fusion of substances, is λ = 25000 J / kg.

By the value Q = 25000 J, 1 kg of liquid lead at the melting temperature has a greater internal energy than 1 kg of solid lead at the same temperature.



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