1. This prevents the body from oxidizing food to produce useful energy . 2. However, a militarily useful energy is achieved with as little as several kilojoules. 3. Take nuclear power; you can't take useful energy out of a nuclear bomb! 4. In addition, exergy, which is a measure of useful energy can be used. 5. Once, our self-obsession had a certain vitality and could be mistaken for useful energy . 6. This makes it the ideal ingredient in the process of creating biogas and recovering useful energy . 7. He viewed coal as a useful energy source and needed material for establishing railroads within the district. 8. Assuming heat engine extraciton of useful energy from a fusion reactor, there will be a transfer material. 9. This means that less fuel needs to be consumed to produce the same amount of useful energy . 10. In other words, in any natural process there exists an inherent tendency towards the dissipation of useful energy .