Definition: The word "energy" means the ability to do work or perform a task. It is often used in relation to human bodies, but it can also refer to an inherent quality that enables organisms to carry out essential activities such as breathing, walking, swimming, and even thinking. Energy can be measured using different units such as joules (J) for electrical energy and ergs (erg), which are the joules of gravitational potential energy in a vacuum or atmosphere.
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