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水是到处游荡的流浪汉,江、湖、海洋是它的家。有时候它变成轻盈的白云飘在天空,有时候它却又隐藏在深深的地底下。它是生物不可分离的朋友,它的足迹遍天下。也许有人会说:我们对水已经很了解了。可是你可知道,水除了它自己之外还有两位体重较重的哥哥,一个叫重水,一个叫超重水吗?二哥重水在普通水中虽然也有,但很少;大哥超重水在自然界中稀少得几乎等于没有,所以很少有人知道它俩。和我们朝夕相见的是它们之中体重最轻的小弟弟——水。这三位水兄弟的外表可真长得十分相似,要不是把它分别放在磅秤上称一称体重的话,简直难分谁是兄谁是弟。水的体重在三兄弟中最轻,一公升水在摄氏20度时重0.9982公斤。重水的体重要重一些,一公升重水在摄氏20度时重1.105公斤。超重水最重,达1.21公
Water is a homeless wanderer. Rivers, lakes and oceans are its homes. Sometimes it becomes a light white cloud floating in the sky, and sometimes it is hidden deep under the ground. It is a biologically inseparable friend, and its footprints are all over the world. Some people may say: We already know about water. But do you know that water has two big brothers in addition to its own, one is heavy water and the other is super heavy water? The second brother has heavy water in ordinary water, but it is rare; Big brother has overweight water in nature. Rarely equal to no, so few people know it. And we meet each other day and night is the lightest younger brother of them - water. The appearance of the three water brothers is very similar. If it were not to put it on the scales and weigh them, it would be difficult to distinguish who is the brother or the brother. Water weighs the lightest among the three brothers, and a liter of water weighs 0.9982 kg at 20 degrees Celsius. The weight of heavy water is more important. A litre of heavy water weighs 1.105 kg at 20 degrees Celsius. Overweight water is heaviest, reaching 1.21