Ever heard of the term "heavy water"? It's the common name of what is also known as deuterated water, D2O. It is formed by the 2 isotopes of hydrogen deuterium. As deuterium is twice the mass of protium (the most common form of hydrogen), this water is "heavy". In fact, it is so "heavy" that its ice sinks in water.
Like typical Singaporeans, your next question most likely is "can drink or not?".
And the answer is yes, but not in a large quantity. Because it behaves chemically like water, it is not toxic. However, since deuterated water does have some physical properties that is different from our usual water, if we consume just pure deuterated water over a period of time, biological processes will be affected.
Read more about it here.
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