a pint's a pound, the whole world round

Wait, this is about the weight of a pint, not the price? I've been robbed!

But anyway - what I was getting at was what Señor Faldaje meant - metrically, you can take linear measurements of a body of water (and water's a pretty good approximation of density if you're working with most other liquids) and come up with the weight of the water. I think this is so cool, when it first dawned on me, I was struck dumb. And those nearby were struck with gratitude.