# Which weighs more ?

Which weighs more…a pint of milk or a pint of cream ? After all, cream floats to the top of milk.

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Sure it floats. At 4.4 deg C the density of homogenized milk is 1.033 kg/l, that of heavy cream is 1.008 kg/l. A pint of milk weighs more. You could look it up. Which I did. Here.

Since cream floats to the top of milk, the milk must weigh more than the cream. QED!

There’s an assumption here that the two pints are the same volume. If it were a US pint of milk (473 ml) and an imperial pint of cream (568 ml). the pint of cream would weigh more.

If you ask the similar question, “Which weighs more, an ounce of gold or an ounce of lead?”, the answer is, “an ounce of gold”, because (conventionally) gold and lead are weighed with difference ounces, the troy ounce (31.1 g) and avoirdupois ounce (28.3 g) respectively.

Only on the Dope. It’s a reasonable assumption in regards to milk/cream; it’s not like milk is conventionally measured in US pints, and cream is conventionally measured in Imperial pints. That’d be a really lame “gotcha.” Now, if you asked “What weighs more, a pint of Guinness in Dublin or a pint of Guinness in Boston?” then your gotcha might be fair.

Yes, the pint-of-Guinness example is a good one. (Green for the Irish)

Damn. And I thought this was going to be about a pound of feathers vs. a pound of dark chocolate.
(The feathers weigh more.)

You can’t trick me, this one is obvious. They both weigh a pint.

I would say the weight depends entirely on the local gravitational field.

Maybe he’s using heavy cream.

Not once they reach your thighs, amirite?

I’ll go now…

Is cream actually lighter, or is it the fat that makes it float?

Yes, exactly. Did you mean to put some other alternative in there?

The cream is lighter by volume, *because *of the fat, and that’s *why *it floats. That is, a pint of cream (2 cups) and a pint of milk (2 cups) will take up the same space in your measuring cup, but the cream will weigh less than the milk. The fat in the cream takes up more room than the water in milk.

Remember the formula for density: Density equals Mass divided by Volume. (For our purposes, we can use Weight to mean the same thing as Mass, although that’s not strictly true.)

So when we say that cream is less dense than milk, we’re *literally *saying it has less mass for the same volume when we compare it to milk, and that’s because the fat in in has less mass than the same volume of the water in the milk.

Now, which causes you to gain more weight: 2000 Calories of heavy cream or 2000 Calories of skim milk?

(I vaguely recall hearing that this isn’t as dumb a question as it sounds.)

Thanks. I was kinda pulling the OP’s leg a bit.

Oh.
How much does a whooosh weigh?

A metric whooosh, Imperial whooosh, or US customary whooosh?

Does the cream, being lighter, have a slightly higher center of gravity? That would make it farther from the center of the earth, and even lighter.