Drinking heavy water

[clevername]

@Enkita

It gives the molecule extra mass.One litre of D2O has an extra 107g of mass compared to one litre of H2O,but one kg of either will have exactly the same weight. Newton died in 1727, nearly three hundred years ago, we’ve got used to people orbiting the Earth, and yet writers still can’t get the difference between mass, density and weight.

You are assuming far too much. No one said anything about comparing the weights of equal masses because we aren’t stupid. We are comparing equal quantities. The SI unit for quantity of a substance is the mole. Water weighs about 18 g/mol, D2O weighs about 20 g/mol, a difference of about 10%. QED. Yes, I know grams are a unit of mass not weight. I don’t care and unless you can tell me your weight in Newtons or slugs without a unit conversion chart neither do you Stop looking for excuses to be an insufferable pedant unless you can out-pedant everyone in the room.