2007-09-04 05:09:15 · 15 answers · asked by Anonymous in Science & Mathematics ➔ Other - Science
hahahaa
should think they were both the same
2007-09-04 05:12:28 · answer #1 · answered by Anonymous · 3⤊ 5⤋
I think you may be confused with Density.
A given amount of water - a pint say - will always have the same mass, and so will show the same weight on scales whatever its temerature (let's say the water remains liquid!) However, as the water increases its volume when heated, it will show a reduction in its density. (Density is Mass/Volume)
This might cause it to rise above water at a lower temperature if the conditions allow. This is similar to the way a hot air balloon floats.
I hope this helps.
MM
2007-09-05 12:22:21 · answer #2 · answered by MildMellow 2 · 0⤊ 1⤋
As people have mentioned:
If you have exactly 1pint of liquid, the cold liquid weighs more.
If you take 1pint of cold water and heat it, you will find its volume expands to slightly over 1pint. Neglecting this, the hot water will then be (imperceptibly) heavier now, since you've added energy at a rate of 4.65 Ã 10-14 grams/C.
This means that if you have water at 0C and then heat the water to 100C (and none evaporates) the 100C water is 4.65*10^-12 grams heavier, but also less dense, so when you measured out a new pint, the hot pint is lighter.
2007-09-04 14:38:46 · answer #3 · answered by supastremph 6 · 1⤊ 2⤋
However, if you took a pint of cold water, raised its temperature and allowed it to expand, the mass would be the same
2007-09-04 17:08:46 · answer #4 · answered by Andy D 4 · 1⤊ 1⤋
Well ask yourself when is water most dense?
It's the cold water but only marginally, and you would need some seriously sensitive instruments to measure it.
Of course if it freezes you lose because water loses density when it freezes.
And for those a pint is a pint people, a pint is a measure of volume not mass.
If you want proof go to the beach the deeper you get the colder it is, becasue the cold water is denser.
2007-09-04 12:14:40 · answer #5 · answered by Brian K² 6 · 2⤊ 4⤋
They both have the same exact mass regardless of temperature.
Whether it's 4 millions degrees or -350 degrees. They have the same number of molecules, therefore, they have the same mass.
I assume I'm getting thumbs down because people are assuming that this is an open system, in which case some of the water molecules would be able to "leave" the system and expand to more than a pint: pv/t = pv/t
I'm assuming a pint is a pint, a closed vessel. In which case the pressure would rise, but the same number of molecules would occupy the same amount of space. So thank you for the thumbs down for a correct answer.
2007-09-04 12:17:01 · answer #6 · answered by Anonymous · 1⤊ 7⤋
When hot, water molecules occupy a slightly larger area since they vibrate more. It's negligible though.
So although in practice it cannot be measured, in theory a hot pint will have a lower mass than a cold pint. This is because a lower amount of molecules occupy the same area in comparison.
2007-09-04 12:13:32 · answer #7 · answered by George K 2 · 7⤊ 5⤋
probably the cold since it would be denser due to atomic movement. but when it freezes its less dense again so who knows?
it wouldn't be much anyway
2007-09-07 18:28:15 · answer #8 · answered by Anonymous · 0⤊ 0⤋
They are the same they both weigh a pint. Love the trick question!!
Peace out!
2007-09-04 12:15:58 · answer #9 · answered by K.Kirkpatrick 3 · 1⤊ 6⤋
um same. both a pint doesnt matter if it is hot or cold
2007-09-04 12:16:32 · answer #10 · answered by ? 3 · 2⤊ 4⤋
Molecular activity increase in water as it is heated.
The volume would be the same but the density would be less and the weight also.
2007-09-04 12:16:16 · answer #11 · answered by Billy Butthead 7 · 2⤊ 5⤋