Question

"Heat energy cannot be completely transformed into work without producing some change somewhere", is the statement of:​

Answer 1

Answer:

It is a statement of thermodynamics

Answer 2

Answer:

"Heat energy cannot be completely transformed into work without producing some change somewhere", is the statement of Second law of thermodynamics for heat engines.

Explanation:

Second law of thermodynamics: (heat engines)

Based on Clausius statement:

"It is impossible to extract an amount of heat $Q_{H}$ from a hot reservoir and use it all to do work W. Some amount of heat $Q_{C}$ must be exhausted to a cold reservoir."

According to conservation of energy:

$Q_{H} = W + Q_{C}$

$Q_{H} = High temperature heat is added\\Q_{C} = Heat removed by cold temperature\\ W = Work done by heat energy$

According to Second law of Thermodynamics, the low grade energy cannot be completely converted to high grade energy.

When work is done it can be completely change to heat but heat can not be completely change to work.

• Work : High grade energy
• Heat : low grade energy

Second law of thermodynamics is also known as Kelvin-Planck statement.

The heat transfer from the cold body to the hot body takes place by the transfer of electromagnetic radiation.

Heat engine and Refrigerator works on the basis of this principle.

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