人们在1929年发现了氧的同位素,1932年发现了氢的同位素,也发现了重水。现在知道氢有三种同位素:氢(~1H),氘(~2H或D),氚(~3H或T),分别与普通氧(~(16)O)结合成普通水,重水和超重水。这三种水在密度、沸点、冰点、热容、化学反应速度等方面都有差别。现在有人估计地 People discovered oxygen isotopes in 1929, discovered hydrogen isotopes in 1932, and also found heavy water. It is now known that hydrogen has three isotopes: hydrogen (~1H), helium (~2H or D), and helium (~3H or T), which combine with ordinary oxygen (~(16)O) to form ordinary water, heavy water and super heavy water. These three types of water have differences in density, boiling point, freezing point, heat capacity, and chemical reaction speed. It is now estimated that