Which weighs more, a litre of ice or a litre of water?

The Scientist · « **on:** 03/07/2010 10:02:26 »

Please provide explanations. Thanks!

Carbonizer · « **Reply #1 on:** 03/07/2010 15:14:10 »

The litre of water weighs more, and this is why ice floats in water. When water freezes, it expands and becomes becomes less dense. While it is true that most things are more dense in their solid state, it is not true of water.

JaneMiller · « **Reply #2 on:** 02/05/2018 04:09:14 »

I agree with Carbonizer. Water is heavier

Bill S · « **Reply #3 on:** 03/05/2018 00:06:20 »

Would this distinction hold in zero gravity?
I would think not, but I've been wrong before.

chiralSPO · « **Reply #4 on:** 03/05/2018 00:09:55 »

Quote from: Bill S on 03/05/2018 00:06:20

Would this distinction hold in zero gravity?
I would think not, but I've been wrong before.

I think you are correct.

1 L of water is more massive than 1 L of ice. This will translate into greater weight if any force is applied to the samples.

wolfekeeper · « **Reply #5 on:** 03/05/2018 01:14:06 »

It depends. A litre of ice can have a density of 1.65 times that of normal water, so I'm going with ice, unless it's specified to be at normal pressure, in which case it's water that is denser:

https://en.wikipedia.org/wiki/Ice_VII

evan_au · « **Reply #6 on:** 03/05/2018 09:37:34 »

This chart suggests that even at -200C, ice is less dense than liquid water at 100C.
I assume that this is taken at standard pressure, so that no exotic phases of ice were present.
https://en.wikipedia.org/wiki/File:Density_of_ice_and_water_(en).svg

PmbPhy · « **Reply #7 on:** 03/05/2018 11:28:29 »

Quote from: Bill S on 03/05/2018 00:06:20

Would this distinction hold in zero gravity?
I would think not, but I've been wrong before.

Water would still be more dense so if you had a comnination of water and ice in a centrifuge aboard the ISS the ice would still float to the surface of the water. But since nothing weighs anything in a weightless environment they its meaningless as you said.

LaurenaS · « **Reply #8 on:** 19/01/2021 15:38:06 »

I guess the answer to this question is slightly open. Water is actually denser than ice at one liter. So I would say water. And if the same one liter of water gets frozen it even gain more on its volum

Halc · « **Reply #9 on:** 19/01/2021 17:47:30 »

Quote from: LaurenaS on 19/01/2021 15:38:06

I guess the answer to this question is slightly open.

The question was answered 10 years ago by the first reply. Any reason you are finding the need to dredge up all these old threads asked by people no longer active on the site?

Quote

Water is actually denser than ice at one liter.

This comment makes it sound like ice might be more dense than water at a different volume.

myuncle · « **Reply #10 on:** 28/01/2021 01:51:51 »

Isn't 1kg of iron=1 kg of wool?

chiralSPO · « **Reply #11 on:** 28/01/2021 02:35:37 »

Quote from: myuncle on 28/01/2021 01:51:51

Isn't 1kg of iron=1 kg of wool?

yes, but liters (volume) ≠ kg (mass)

myuncle · « **Reply #12 on:** 28/01/2021 12:58:01 »

Quote from: chiralSPO on 28/01/2021 02:35:37

Quote from: myuncle on 28/01/2021 01:51:51
Isn't 1kg of iron=1 kg of wool?
yes, but liters (volume) ≠ kg (mass)

I know, but the question was about weight, not about mass, volume or density.

Halc · « **Reply #13 on:** 28/01/2021 13:34:11 »

Quote from: myuncle on 28/01/2021 12:58:01

I know, but the question was about weight, not about mass, volume or density.

The (11 year old) question was about the weight of two equal volumes, not the weight of two equal masses.

myuncle · « **Reply #14 on:** 28/01/2021 14:15:23 »

Quote from: Halc on 28/01/2021 13:34:11

Quote from: myuncle on 28/01/2021 12:58:01
I know, but the question was about weight, not about mass, volume or density.
The (11 year old) question was about the weight of two equal volumes, not the weight of two equal masses.

The word volume is not even mentioned, it asks only about the weight.

Bored chemist · « **Reply #15 on:** 28/01/2021 14:58:09 »

Quote from: myuncle on 28/01/2021 14:15:23

The word volume is not even mentioned

The word "litre" is used, and that specifies a volume.

Janus · « **Reply #16 on:** 28/01/2021 16:31:14 »

Quote from: myuncle on 28/01/2021 14:15:23

Quote from: Halc on 28/01/2021 13:34:11
Quote from: myuncle on 28/01/2021 12:58:01
I know, but the question was about weight, not about mass, volume or density.
The (11 year old) question was about the weight of two equal volumes, not the weight of two equal masses.

The word volume is not even mentioned, it asks only about the weight.

Litre = volume.
Now is is true that 1 litre = ~1.057 qt. , and 1 qt = 32 fl oz.
Since an ounce is a measure of weight, I could see where someone might make the mistake of thinking a litre could also be a weight.
However, qts are measured in "fluid ounces", and fluid ounces are units of volume, not weight.

myuncle · « **Reply #17 on:** 28/01/2021 18:16:16 »

Ah, ok, I thought the weight was only about the attraction towards the Earth, measured in Newton, and the mass is measured in Kg, regardless of temperature or gravity.

alancalverd · « **Reply #18 on:** 28/01/2021 18:39:20 »

The fact remains that a liter of water has a greater mass than a liter of ice, and therefore in any gravitational field, a greater weight. Temperature is important (or irrelevant, depending on how you look at it!) because at ambient pressures you can only have both ice and water present at 273.15K.

AntonySilva · « **Reply #19 on:** 04/02/2021 21:32:03 »

I think a liter of water

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Which weighs more, a litre of ice or a litre of water?

The Scientist (OP)

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