But this seems not so, and in
most of the transformations of energy and of matter entity "X" does not
appear. However, we have no satisfactory means of recognizing entity
"X," no methods of studying it. Therefore, it may well be that it is
noticed only in those rare instances when it appears of high intensity,
but in most reactions entity "X" may be so small or appear in such way
as to escape observation by the means and by the methods now available.
Like energy or matter, entity "X" may have many forms in which it is not
recognized by us, just as for a long time the flame was not recognized
as the entity energy.
To illustrate, again by analogy: In many transformations of matter,
indeed, in most of the more complex ones of the organic world, the
concurrent energy transformation is of such slowness and of such low
intensity that it appears nonexisting, and can be discovered and
measured only by the delicate experiments devised by science.
Furthermore, the energy may appear in different forms. Thus the 293,000
J. of energy in equation (2) may appear as heat, or as electrical
energy, or as a combination of heat, light, sound, and mechanical
energy.
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