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Published online by Cambridge University Press: 19 February 2018
The first thing I wish to call to your attention is the distinction between the foot-pound and the cubic foot. The footpound is used to measure work, and when work is stored it is called energy. The cubic foot is used to measure material substances, or the space in which bodies are contained. What I have to say relates to things measured by the footpound or corresponding unit, and not to things measured by the cubic foot.
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