The book The Conservation of Energy .. was written by author Balfour Stewart Here you can read free online of The Conservation of Energy .. book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Conservation of Energy .. a good or bad book?
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It is this chemical separation that is meant when we speak of coal as a source of energy. Coal, or carbon, has a great attraction for oxygen, and whenever heat is applied the two bodies unite together. Now oxygen, as it exists in the atmosphere, is the common inheritance of aU, and if, in addition to this, some of us possess coal in our cellars, or in pits, we have thus secured a stoye of 60 THE CONSEEVATION OF ENERGY. energy of position which we can draw upon with more facility than if it were... a head of water, for, although we can draw upon the energy of a head of water whenever we choose, yet we cannot carry it about with us from place to place as we can with coaL We thus perceive that it is not the coal, by itself, that forms the source of energy, but this is due to- the fact that we have coal, or carbon, in one place, and oxygen in another, while we have also the means of causing them to unite with each other whenever we wish. If there were no oxygen in, the ail', coal by itself would be of no value.
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