众所周知，冰在0℃开始融化。然而，世界上竟然有“热冰”——它在3．8℃才融化！是不是结成这种冰的水不纯呢？不，这是道道地地的水，但又与普通的水不同，它叫重水。重水与普通水的不同，只是在于组成重水的氢原子不是普通的氢原子，而是重氢，学名叫做“氘”［dao］。重红? It is well known that ice begins to melt at 0 ° C. However, there is actually “hot ice” in the world - it melts at 3.8 ℃! Is it not made of water such as ice impure? No, this is the water of the Dow Road, but unlike ordinary water, it is heavy water. Heavy water and ordinary water is different, only lies in the composition of heavy hydrogen atoms are not ordinary hydrogen atoms, but heavy hydrogen, scientific name is called “deuterium” [dao]. Red?