large/12904/worldswithinworlds_v1-3_1904_librivox_64kb_mp3/worldswithinworlds_02_asimov_64kb_9
large/12904/worldswithinworlds_v1-3_1904_librivox_64kb_mp3/worldswithinworlds_02_asimov_64kb
English
12904
Next, imagine pulling apart hydrogen and oxygen molecules into hydrogen and oxygen atoms and then having those atoms come together to form _water_ molecules. NEXT IMAGINE PULLING APART HYDROGEN AND OXYGEN MOLECULES INTO HYDROGEN AND OXYGEN ATOMS AND THEN HAVING THOSE ATOMS COME TOGETHER TO FORM WATER MOLECULES
s made up of 2 oxygen atoms (O₂) and of the water molecule (H₂O). Always the amount of energy absorbed in one change is given off in the opposite change. The amount absorbed and the amount given off are always exactly equal. However, the amount of energy involved differs from molecule to molecule. It is quite hard to pull hydrogen molecules apart, and it is even harder to pull oxygen molecules apart. You have to supply about 12% more energy to pull an oxygen molecule apart than to pull a hydrogen molecule apart. Naturally, if you let 2 oxygen atoms come together to form an oxygen molecule, you get back 12% more energy than if you allow 2 hydrogen atoms to come together to form a hydrogen molecule. It takes a considerably larger amount of energy to pull apart a water molecule into separate atoms than to pull apart either hydrogen or oxygen molecules. Naturally, that greater energy is also returned once the hydrogen and oxygen atoms are allowed to come back together into water molecules. WO AND OF THE WATER MOLECULE SYMBOLIZED AS H TWO O ALWAYS THE AMOUNT OF ENERGY ABSORBED IN ONE CHANGE IS GIVEN OFF IN THE OPPOSITE CHANGE THE AMOUNT ABSORBED AND THE AMOUNT GIVEN OFF ARE ALWAYS EXACTLY EQUAL HOWEVER THE AMOUNT OF ENERGY INVOLVED DIFFERS FROM MOLECULE TO MOLECULE IT IS QUITE HARD TO PULL HYDROGEN MOLECULES APART AND IT IS EVEN HARDER TO PULL OXYGEN MOLECULES APART YOU HAVE TO SUPPLY ABOUT TWELVE PER CENT MORE ENERGY TO PULL AN OXYGEN MOLECULE APART THAN TO PULL A HYDROGEN MOLECULE APART NATURALLY IF YOU LET TWO OXYGEN ATOMS COME TOGETHER TO FORM AN OXYGEN MOLECULE YOU GET BACK TWELVE PER CENT MORE ENERGY THAN IF YOU ALLOW TWO HYDROGEN ATOMS TO COME TOGETHER TO FORM A HYDROGEN MOLECULE IT TAKES A CONSIDERABLY LARGER AMOUNT OF ENERGY TO PULL APART A WATER MOLECULE INTO SEPARATE ATOMS THAN TO PULL APART EITHER HYDROGEN OR OXYGEN MOLECULES NATURALLY THAT GREATER ENERGY IS ALSO RETURNED ONCE THE HYDROGEN AND OXYGEN ATOMS ARE ALLOWED TO COME BACK TOGETHER INTO WATER MOLECULES
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