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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Faraday as a Discoverer by John Tyndall: be caused to perform mechanical work. When, for example, two atoms
of hydrogen unite with one of oxygen, to form water the atoms are
first drawn towards each other--they move, they clash, and then by
virtue of their resiliency, they recoil and quiver. To this
quivering motion we give the name of heat. Now this quivering
motion is merely the redistribution of the motion produced by the
chemical affinity; and this is the only sense in which chemical
affinity can be said to be converted into heat. We must not imagine
the chemical attraction destroyed, or converted into anything else.
For the atoms, when mutually clasped to form a molecule of water,
are held together by the very attraction which first drew them
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