Another correspondent quoted a saying that he learned as a kid, "A pint a pound, the world around." This is not strictly true. It IS true to say that 1 ml of water is 1 gram, because it's defined as so. A pound is 454 grams. An American wet pint is 471 grams, which is approximately the same. A British pint is 567 grams, which is definitely more. But this is only talking about water. Since the same amount of different materials will weigh different amounts, this can only be regarded as an extremely approximate conversion. Interestingly enough, the Americans have 16 fluid oz to a pint, while the British have 20 fluid oz to the pint. It turns out that an American dry pint is close to a British pint, while an American fluid oz (wet) is close to the British fluid oz. I don't know if this has any historical significance in the origins of the units!