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The unavailable energy is given off as heat.
To answer this question, we need to understand the concept of the second law of thermodynamics, which states that in any energy transfer or transformation, the total amount of usable energy decreases and the amount of unusable energy, or entropy, increases.
When energy is transferred or conserved, some of it becomes unavailable to do work because it is transformed into a form that cannot be easily used. This unusable energy is given off as heat.
Heat is a form of energy that cannot be completely converted into useful work. It is a random and disordered form of energy that tends to spread out and distribute itself evenly. So, when energy is transferred or transformed, some of the energy becomes heat and is released into the surroundings.
For example, when you burn a fuel, such as gasoline in an engine, the chemical energy stored in the fuel is converted into thermal energy or heat. This heat is dissipated into the environment, and although it can be used in some cases, it cannot be converted back into the original usable form of energy.
In summary, the unavailable energy is given off as heat, which is a form of energy that cannot be easily used to perform work.