An automobile engine is about 20 - 30% efficient in converting chemical energy to mechanical energy.Cells are about 39% efficient in the transformation of glucose to ATP.The rest of the energy is lost as heat.This is illustrative of the:

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The second law of thermodynamics states that in any energy transformation, some energy will be lost as heat, and the amount of disorder in a system will increase over time. The fact that both automobile engines and cells are not 100% efficient in converting energy illustrates this law. The first law of thermodynamics, on the other hand, states that energy cannot be created or destroyed, only transformed from one form to another. The third law of thermodynamics deals with the behavior of matter at absolute zero, and the cell theory is a scientific concept describing the basic unit of life.

An Automobile Engine Is About 20 - 30% Efficient in Converting