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【272】レベル４ Long ago, experiments showed

管理人 - 04/3/27(土) -


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　 Long ago, experiments showed that energy can change its form but cannot be destroyed or created. And matter too, it was decided, cannot be destroyed or created. Wood burns and seems to be gone; but its atoms only change into atoms of gases and spread through the air. Water seems to be gone, when it has boiled away; but it only spreads as steam. Iron as it grows red and soft, grows heavier; but it is not creating matter. (I. Asimov)

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