重水之所以重是因为水中氢的重量是普通氢的两倍（它的原子核中有一个质子和一个中子，而不仅仅是一个质子）。
Heavy water is heavy because the hydrogen in it weighs twice as much as ordinary hydrogen (it has a proton and a neutron in its nucleus, instead of just a proton).
而且原子核越重，K因子的值越小。
注1： 重的元素比铸铁制作的捕获中子的原子核。
Note 1: Elements heavier than iron are produced by the capture of neutrons by atomic nuclei.
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