줄
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정의
1 N의 힘이 1 m 거리에 걸쳐 한 일에 해당하는 SI 에너지 단위(1 J = 1 N·m = 1 kg·m²/s²).
설명
Named after physicist James Prescott Joule. Lifting a 100 g apple by 1 meter requires approximately 1 joule of energy. A food calorie (kcal) equals 4,184 joules; a AA battery stores about 9,000 J; an average human daily caloric intake of 2,000 kcal equals roughly 8.4 million joules.
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