large/12904/worldswithinworlds_v1-3_1904_librivox_64kb_mp3/worldswithinworlds_02_asimov_64kb_74
large/12904/worldswithinworlds_v1-3_1904_librivox_64kb_mp3/worldswithinworlds_02_asimov_64kb
English
12904
If a system of matter were isolated and made to undergo complicated chemical reactions, everything about it might change, but not its mass. IF A SYSTEM OF MATTER WERE ISOLATED AND MADE TO UNDERGO COMPLICATED CHEMICAL REACTIONS EVERYTHING ABOUT IT MIGHT CHANGE BUT NOT ITS MASS
 said to possess “energy” from Greek words meaning “work within”. There are various forms of energy. Any moving mass possesses energy by virtue of its motion. That is, a moving hammer will drive a nail into wood, while the same hammer held motionlessly against the nailhead will not do so. Heat is a form of energy, since it will expand steam that will force wheels into motion that can then do work. Electricity, magnetism, sound, and light can be made to perform work and are forms of energy. The forms of energy are so many and so various that scientists were eager to find some rule that covered them all and would therefore serve as a unifying bond. It did not seem impossible that such a rule might exist, since one had been found in connection with matter that appeared in even greater variety than energy did. All matter, whatever its form and shape, possessed mass, and in the 1770s, the French chemist Antoine Laurent Lavoisier (1743-1794) discovered that the quantity of mass was constant.  FROM GREEK WORDS MEANING WORK WITHIN THERE ARE VARIOUS FORMS OF ENERGY ANY MOVING MASS POSSESSES ENERGY BY VIRTUE OF ITS MOTION THAT IS A MOVING HAMMER WILL DRIVE A NAIL INTO WOOD WHILE THE SAME HAMMER HELD MOTIONLESSLY AGAINST THE NAIL HEAD WILL NOT DO SO HEAT IS A FORM OF ENERGY SINCE IT WILL EXPAND STEAM THAT WILL FORCE WHEELS INTO MOTION THAT CAN THEN DO WORK ELECTRICITY MAGNETISM SOUND AND LIGHT CAN BE MADE TO PERFORM WORK AND ARE FORMS OF ENERGY THE FORMS OF ENERGY ARE SO MANY AND SO VARIOUS THAT SCIENTISTS WERE EAGER TO FIND SOME RULE THAT COVERED THEM ALL AND WOULD THEREFORE SERVE AS A UNIFYING BOND IT DID NOT SEEM IMPOSSIBLE THAT SUCH A RULE MIGHT EXIST SINCE ONE HAD BEEN FOUND IN CONNECTION WITH MATTER THAT APPEARED IN EVEN GREATER VARIETY THAN ENERGY DID ALL MATTER WHATEVER ITS FORM AND SHAPE POSSESSED MASS AND IN THE SEVENTEEN SEVENTIES THE FRENCH CHEMIST ANTOINE LAURENT LAVOISIER SEVENTEEN FORTY THREE SEVENTEEN NINETY FOUR DISCOVERED THAT THE QUANTITY OF MASS WAS CONSTANT
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