It is my understanding that a pint of water weighs a pound, by definition. I buy my butter by the pound. It contains 4 sticks which are labeled as 1/2 cup each, so by simple math I can discover a pint of butter weighs a pound. Since butter floats in water we can deduce something is mislabeled. So do I have a pound of butter or a pint? and how much does a pint of butter actually weigh?
Water 8.33 pounds per U.S. gallon
Butter 8 pounds per U.S. gallon
The “pint’s a pound” for water thing is just a very rough approximation, anyway. A pint (16 US fl. oz.) of pure water actually weighs closer to 1.21 pounds.
For values of 1.21 pounds sufficiently close to 1.04 pounds, anyway.
:smack: I didn’t notice the online conversion calc I was using was set to dry pints, not fluid. Who the hell uses dry pints, anyway?
You should have covered saying you were thinking of Imperial pints, which weigh about 1.25 pounds, rather than US. 
I’ve always been amused by the rhyme to remember this relationship, “A pint a pound the world around,” since it doesn’t even work between the US and UK. The rhyme I heard in New Zealand, which uses Imperial, was “A pint of water weighs a pound and a quarter.”
Since I’m from the US, I think that strategy would have backfired. 
[fine print]Mnemonic adages are not legally enforceable[/fine print]
I never knew any of this before… weird. This is why the Metric system is simply beter in all ways
That must have been a while ago, because we switched to metric over 30 years ago. Nowadays a litre of water weighs a kilo. Simple as that.
It was in the early 1980s, but I am sure people still know what a pint is. I bet some people still give their weight in stones, too.
Who’d a thunk! All along my childhood mnemonic rhymes lied to me, and corporate America was forthright and true. Ignorance fought. Thankls
On a more practical note, it’s a pretty good approximation to say that anything organic has the same density as water. Sure, they’ll be a little bit more or less, but you don’t often need the exact values.
I’m definitely going to start using “a pint of flesh” instead of “a pound of flesh” whenever appropriate.
I’m not really imagining the accent required to make that rhyme very well.
Strawberry distributors
We used to get strawberries and other fruit in pint and quart baskets. Didn’t know till later that those were dry pints and quarts. And not necessarily Imperial pints and quarts either, since the suppliers were in the States. Dry US pints and quarts differ from both wet US pints and quarts and Imperial pints and quarts. Yeah, metric is such a pain.
And water doesn’t even rhyme with quarter, at least here.
Heh. I can’t imagine the accent required to make it *not *rhyme
We often don’t take much notice of "r"s after vowels in our pronciations. And, absent that, they’re spelt the same.
We don’t take much notice of r’s either, but “water” still doesn’t rhyme with “quarter”. 
It rhymes in the Bronx, where I’m from.
Wuah 'uh
Kwuah 'uh