The book Familiar Letters On Chemistry was written by author Liebig Justus Freiherr Von Here you can read free online of Familiar Letters On Chemistry book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Familiar Letters On Chemistry a good or bad book?
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All living creatures, whose existence depends upon the absorption ofoxygen, possess within themselves a source of heat, independent ofsurrounding objects. This general truth applies to all animals, and extends to the seedof plants in the act of germination, to flower-buds when developing, and fruits during their maturation. In the animal body, heat is produced only in those parts to whicharterial blood, and with it the oxygen absorbed in respiration, isconveyed. Hair, wool, and feathers, receiv...e no arterial blood, and, therefore, in them no heat is developed. The combination of acombustible substance with oxygen is, under all circumstances, theonly source of animal heat. In whatever way carbon may combine withoxygen, the act of combination is accompanied by the disengagementof heat. It is indifferent whether this combination takes placerapidly or slowly, at a high or at a low temperature: the amount ofheat liberated is a constant quantity. The carbon of the food, being converted into carbonic acid withinthe body, must give out exactly as much heat as if it had beendirectly burnt in oxygen gas or in common air; the only differenceis, the production of the heat is diffused over unequal times.
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