Marine Corps Physical Fitness Test. Fitness is essential to the day-to-day effectiveness and combat readiness of the Marine Corps. The Marine Corps considers physical fitness an indispensable aspect of leadership.
A: Chemical energy is for producing heat in the human body to sustain vital functions, converting solar energy in plants through photosynthesis, producing electrical energy in batteries to power devices and burning fossil fuels in combustion engines to produce heat or motion.
1 The most common use of chemical energy is the food we consume to generate enough energy to live, work, think, etc. 2  Our body is a chemical machine that breaks down the food to produce heat and other forms of energy (electrical for the nerves) in order to sustain all vital functions. Wood, oil, coal and other forms of fossil fuels are burned inside combustion engines to convert chemical energy into heat or motion. 2  These fuels are also burned to produce electrical energy, light and mechanical energy depending on the device and the purpose of use.