Question

explain uper words please???????? ¿???????????
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Answer 1

Answer:

CALORIFIC VALUE:

The energy contained in a fuel or food, determined by measuring the heat produced by the complete combustion of a specified quantity of it. This is now usually expressed in joules per kilogram.

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Answer 2

Answer:

Fuel efficiency is a form of thermal efficiency, meaning the ratio from effort to result of a process that converts chemical potential energy contained in a carrier (fuel) into kinetic energy or work.

Explanation:

Fuel efficient vehicles require less gas to go a given distance. When we burn less gas, we cut global warming emissions and produce less pollution, while spending less on gas—a lot less.

Wind, the most efficient fuel for electricity, creates 1164% of its original energy inputs when converted into electricity; on the other end of the efficiency spectrum, coal retains just 29% of its original energy.