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Obviously I know ice is just solid water but would ice be heavier than the same volume of water if you account for the expansion of water as it freezes?

I'm only curious because I know that as water freezes it traps air molecules inside its crystalline structure so I was wondering if it trapped enough to cause a distinguishable difference in weight between the two states.

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[-] TheLeadenSea@sh.itjust.works 6 points 1 week ago

The same volume of ice as water will be lighter, since it is less dense. That's why ice floats on water

[-] JohnnyEnzyme@piefed.social 1 points 1 week ago

Well, that's the answer in terms of comparative density, but in terms of comparative weight, I'm wondering if the ice would indeed be heavier since it commonly traps additional gases in the freezing process.

So yeah, I'm not entirely sure if OP was talking more about weight or density.

@thatweirdguy1001@lemmy.world

[-] DrBob@lemmy.ca 0 points 1 week ago

Density is mass by volume. The volume changes because of the crystalline lattice. The mass doesn't change. I'm trying to decide if you're trolling or not.

[-] TheRealKuni@piefed.social 1 points 1 week ago

They aren’t wrong. You’re keeping the mass constant, they’re keeping the volume constant.

I think the confusion might come from their phrasing: “the same volume of ice as water,” which could mean “the same volume of ice as the volume of water” (which is what they meant), but could also be interpreted as “the same volume of ice in the form of water.” The latter interpretation doesn’t fit the rest of their sentence though, so we can safely assume they meant the former.

[-] ThatWeirdGuy1001@lemmy.world 0 points 1 week ago

I blame the fact I just woke up for not thinking about the difference in density 😅 I was just filling up my water bottle with ice cubes and thought about how ice expands and my brain went "bigger must mean heavier"

[-] MajorMajormajormajor@lemmy.ca 1 points 1 week ago

So here's a question for you? What weighs more, a kilogramme of steel or a kilogramme of feathers?

[-] Visstix@lemmy.world 0 points 1 week ago
[-] CombatWombatEsq@lemmy.world -1 points 1 week ago* (last edited 1 week ago)

It’s an old riddle that only works with imperial units. In traditional British (i.e. completely insane) fashion, the imperial weights and measures had two pounds in it, and you had to choose the right pound for the right thing you were weighing. The troy pound was used to measure metals and only has 12 ounces, whereas the pound used to measure feathers had 16, so a pound of feathers was 4 ounces heavier than a pound of steel or gold or whatever.

[-] bluGill@fedia.io 0 points 1 week ago

A pound is the same for both. The oz measure is what was different. Thus an oz of metal is heavier than an oz of feathres. However a pound of both weights the same.

[-] yermaw@sh.itjust.works 0 points 1 week ago

No. Steel is heavier than feathers.

[-] pitaya@lemmy.zip 0 points 1 week ago
[-] gwl@lemmy.blahaj.zone 1 points 1 week ago

This comment section is fucking hilarious, people not getting the joke and others making them the butt of it

[-] dumples@piefed.social 4 points 1 week ago

If you measure the weight of a glass of water and then freeze that same glass the weight will not change. The volume will increase but the mass will be static which accounts for the decrease in density

[-] als@lemmy.blahaj.zone 2 points 1 week ago

Per gram, they weigh the same

[-] Ephera@lemmy.ml 1 points 1 week ago* (last edited 1 week ago)

Ackshually, gram is a measurement of mass, not of weight. And because a gram of ice takes up more volume than a gram of water, it is likely to float on top of the water, where it is slightly further away from the center of gravity, therefore experiencing less strong gravity. As such, a gram of ice likely weighs less than a gram of water. :P

(I spent far too long thinking how I could torpedo that silly joke of yours, because I figured there must be something with mass vs. weight there. 🫠)

[-] gedaliyah@lemmy.world 1 points 1 week ago

Water is weirdly one of the only materials that is lighter (less dense) in its solid form. That's why ice cubes float.

When a mass expands, it ALWAYS becomes less dense.

Water does not "trap" air molecules as is freezes, although water may contain dissolved gasses.

this post was submitted on 05 Jan 2026
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