Question

the efficiency of a fuel is expressed in terms of its ​

Answer 1

Fuels differ in their efficiency and cost. Fuel efficiency is expressed in terms of its calorific value which is expressed in units of kilojoule per kg.

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Answer 2

Answer:

future used to to fly the jet plane and rocket launchers

Explanation:

it will be very harmful for nature and the most important point it is will be inexhaustible natural source it will be sent by the human activities