Question about ice...

User45701

Does ice get warmer as it melts?

i have a mini fridge her beside me so my bacardi oro is and my mixer are saying the same tempeture but the fridge has no freezer so i bought the ice up in two pint glases over an hour ago.

Anyway ice is ice for water to freeze it has to be below certin tempeture but my question is this. As it begins to melt (theres about a inch of water in the bottom of the pint glass now but the ice is still solid)

The drink does not seem as cold as the last few, so as the ice melts even though its still frozen is it not "as frozen" meaning its not as cold as it could be? but its still frozen - its still below freezing in tempeture, if it where any warmer it wouldnt be ice.

so does ice get wamer as it melts? i thought the outer layer got warmer and melted but the cube itself maintained the same temperature untill its completly melted?

giggsy664

Yes.

Mark200

Yes. Ice can be below 0 degrees, just like water can get warmer before it boils and turns into gas.

PeakOutput

as far as i know ice can be any temperature below 0 celsius

so if you have a good freezer that is freezing things to say -20celsius you are going to get ice. when it is removed form the freezer this ice has 20degrees of warming to do before it becomes water.

i dont know how likely it is to have a freezer make something that cold though

Mmcd

PeakOutput wrote: »

as far as i know ice can be any temperature below 0 celsius

so if you have a good freezer that is freezing things to say -20celsius you are going to get ice. when it is removed form the freezer this ice has 20degrees of warming to do before it becomes water.

i dont know how likely it is to have a freezer make something that cold though

Cool!

Overflow

Ice will always have a core temperature, which can be anything below zero.

Abi

Overflow wrote: »

Ice will always have a core temperature, which can be anything below zero.

Im flushing yore head down the jax at lunch time.

Ostrom

Warmer doesnt have to mean above 0

Overflow

Abigayle wrote: »

Im flushing yore head down the jax at lunch time.

Dont forget the atomic wedgie!

Fringe

It will be below 0 when you take it out of the freezer. Then it will get to to the point of 0 degrees and it will stay like that as it melts because of latent heat. The temperature won't rise again until all of the ice is melted. Then it's just plain water and it'll rise again.

Poutbutton

You should have put your ice in a plastic bag and stored it in the sink, it would have stayed frozen longer. Hope your head does'nt ache too much in the morning

RoundyMooney

I got the munchies, maannnnn.

bonerjams03

No.

Latent Heat.

tony 2 tone

When you have ice and water, and the ice is starting to melt, it will stay at zero degrees until all the ice is melted, as any energy absorbed from the surroundings is used to melt the ice.
Hoyvin-glayvin! *fixes glasses*

m5ex9oqjawdg2i

Put a 2 ltr of volvic water in the freezer for a few hours, take it out. It will still be a liquid, take the lid off, it turns to ice... This freaked me out the first time it happened. I think it is to do with the vacume then when the water comes in contact with oxygen it causes a chemical reaction.

challengemaster

Fringe wrote: »

It will be below 0 when you take it out of the freezer. Then it will get to to the point of 0 degrees and it will stay like that as it melts because of latent heat. The temperature won't rise again until all of the ice is melted. Then it's just plain water and it'll rise again.

Assuming that it's standard pressure, yup. Just obeys the laws of physics it does.

humbert

Dallas Crooked Leopard wrote: »

Put a 2 ltr of volvic water in the freezer for a few hours, take it out. It will still be a liquid, take the lid off, it turns to ice... This freaked me out the first time it happened. I think it is to do with the vacume then when the water comes in contact with oxygen it causes a chemical reaction.

I'd say you're describing supercooling which has nothing to do with pressure. Also a change of state isn't a chemical reaction.

Teutorix

no, if it is melting it is allways 0c roughly. the amount of heat in the matter increases but it is latent heat. so while the ice is actually "melting" it is 0c

Im pretty sure thats correct

Overflow

Just keep drinking and dont worry about the physics too much!

m5ex9oqjawdg2i

humbert wrote: »

I'd say you're describing supercooling which has nothing to do with pressure. Also a change of state isn't a chemical reaction.

I'm no scientist. I put my own theory on it. What has it got to do with then? Super cooling. Considering that the water was already in the freezer for hours. Possibly longer. Considering the change happened within a few seconds. There are only two elements that changed in the equation. The lid came off. This let oxygen at the water or there was a vacum.

It wasn't super cooling as it changed from a liquid to a solid. Super cooling is reducing the tempreture of a liquid below freezing without it becomming a solid...?

Abigayle wrote: »

you'll soon be a dab hand. Keep up the practice x.

WTF?

Jemmy

User45701 wrote: »

Does ice get warmer as it melts?

I'm sorry but did nobody else lol?!


I did! :D

Teutorix

Jemmy wrote: »

I'm sorry but did nobody else lol?!


I did! :D

its not that stupid a question if you understand the physics its based around :rolleyes:

Jemmy

Teutorix wrote: »

its not that stupid a question if you understand the physics its based around :rolleyes:

Eh its after hours! Take it to the physics forum! :rolleyes:

User45701

Dallas Crooked Leopard wrote: »

Put a 2 ltr of volvic water in the freezer for a few hours, take it out. It will still be a liquid, take the lid off, it turns to ice... This freaked me out the first time it happened. I think it is to do with the vacume then when the water comes in contact with oxygen it causes a chemical reaction.

Hmm i always thought it had to be fizzy water for that to work?

humbert

Dallas Crooked Leopard wrote: »

It wasn't super cooling as it changed from a liquid to a solid. Super cooling is reducing the tempreture of a liquid below freezing without it becomming a solid...?

Supercooling, a bit like superheating is when the substance goes beyond the point where it would normally change state, but doesn't.

In this case water goes from an amorphous liquid to a crystalline solid which, if I remember correctly, usually requires a seed crystal formed from water and some impurities. However if the water is quite pure(and I don't think most mineral waters are so I could be wrong) this seed may not form at the usual point and the water gets to a lower temperature without changing state. It is then the shock that causes crystallisation to commence and it does so quite rapidly. (It's late so don't quote me)

Teutorix

humbert wrote: »

Supercooling, a bit like superheating is when the substance goes beyond the point where it would normally change state, but doesn't.

In this case water goes from an amorphous liquid to a crystalline solid which, if I remember correctly, usually requires a seed crystal formed from water and some impurities. However if the water is quite pure(and I don't think most mineral waters are so I could be wrong) this seed may not form at the usual point and the water gets to a lower temperature without changing state. It is then the shock that causes crystallisation to commence and it does so quite rapidly. (It's late so don't quote me)

sounds pretty much correct to me

Love the sig btw

User45701

Teutorix wrote: »

sounds pretty much correct to me

Love the sig btw

wouldnt have opened the link without that post n1

Abi

Dallas Crooked Leopard wrote:

WTF?

*LICK*

Teutorix

User45701 wrote: »

wouldnt have opened the link without that post n1

what link, and what post?

m5ex9oqjawdg2i

User45701 wrote: »

Hmm i always thought it had to be fizzy water for that to work?

Aparantly not

Yea I guess it was supercooling.

Cool video on youtube, ignore the retard comments though... Some people are sooo stupid. "OMG it's fog" "OMG it's fake"...

Supercooling

User45701

Teutorix wrote: »

what link, and what post?

Humberts sig link

http://www.boards.ie/vbulletin/showpost.php?p=59122939&postcount=26

already in my fav's and forwarded on the crowed in work
just a nice link/interesting link to have

http://users.gazinter.net/melan/Warn/Warnenu.htm

Teutorix

User45701 wrote: »

Humberts sig link

http://www.boards.ie/vbulletin/showpost.php?p=59122939&postcount=26

already in my fav's and forwarded on the crowed in work
just a nice link/interesting link to have

http://users.gazinter.net/melan/Warn/Warnenu.htm

oh right, twas a mind blowing look at our world for me

Capt'n Midnight

at the triple point
Ice , Water and water vapour ( ~ cold steam ) all coexist at the same temperature

however melting ice takes a lot of energy so ice melting will take heat from your hand faster than water so it will feel colder than water at the same temperature

Fringe

challengemaster wrote: »

Assuming that it's standard pressure, yup. Just obeys the laws of physics it does.

Yeah unless you're at the bottom of the sea, you can assume so :P