large/12904/worldswithinworlds_v1-3_1904_librivox_64kb_mp3/worldswithinworlds_02_asimov_64kb_49
large/12904/worldswithinworlds_v1-3_1904_librivox_64kb_mp3/worldswithinworlds_02_asimov_64kb
English
12904
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. 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
tick together more or less tightly. It takes a certain amount of energy to pull a molecule apart into separate atoms against the resistance of the forces holding them together. If, after being pulled apart, the atoms are allowed to come together again, they give off energy. The amount of energy they give off in coming together is exactly equal to the amount of energy they had to gain before they could separate. This is true of all substances. For instance, hydrogen gas, as it is found on earth, is made up of molecules containing 2 hydrogen atoms each (H₂). Add a certain amount of energy and you pull the atoms apart; allow the atoms to come back together into paired molecules, and the added energy is given back again. The same is true for the oxygen molecule, which is 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. T TAKES A CERTAIN AMOUNT OF ENERGY TO PULL A MOLECULE APART INTO SEPARATE ATOMS AGAINST THE RESISTANCE OF THE FORCES HOLDING THEM TOGETHER IF AFTER BEING PULLED APART THE ATOMS ARE ALLOWED TO COME TOGETHER AGAIN THEY GIVE OFF ENERGY THE AMOUNT OF ENERGY THEY GIVE OFF IN COMING TOGETHER IS EXACTLY EQUAL TO THE AMOUNT OF ENERGY THAT THEY HAD TO GAIN BEFORE THEY COULD SEPARATE THIS IS TRUE OF ALL SUBSTANCES FOR INSTANCE HYDROGEN GAS AS IT IS FOUND ON EARTH IS MADE UP OF MOLECULES CONTAINING TWO HYDROGEN ATOMS EACH SYMBOLIZED AS H TWO ADD A CERTAIN AMOUNT OF ENERGY AND YOU PULL THE ATOMS APART ALLOW THE ATOMS TO COME BACK TOGETHER INTO PAIRED MOLECULES AND THE ADDED ENERGY IS GIVEN BACK AGAIN THE SAME IS TRUE FOR THE OXYGEN MOLECULE WHICH IS MADE UP OF TWO OXYGEN ATOMS SYMBOLIZED AS O TWO 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
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