Does Salt Extend Block Ice Life?????

Submitted: Friday, Mar 14, 2003 at 20:53
ThreadID: 3852 Views:7080 Replies:8 FollowUps:8
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Hi all ....

Dumb question number 99. A guy came over to my camspite recently to check out the performance of my ice box, and he suggested that I should spread salt over the ice and wrap it in newspaper to extend the life of the (block) ice.

Is this correct? I had always thought that salt caused the ice to melt more quickly, which is why they used it in those places were streets were covered in snow/ice etc.

Many thanks in advance .. and no, I am not blonde.

Jack
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Reply By: Bruce from Budget Signs - Friday, Mar 14, 2003 at 21:14

Friday, Mar 14, 2003 at 21:14
jack
i would think that the paper its self would act as an insulator & slow the process of melting down as to the salt im not sure other than that salt will not freeze & is actualy exclued in the freezing process if my chemistry lessons serve my memory right, which is why all the ice at the poles is made up of fresh water, try sprinkiling salt on an ice block & place one unsalted next to it be interesting to see which melts first
Regards BruceBudget Signs
AnswerID: 15216

Follow Up By: Member - Rohan K - Friday, Mar 14, 2003 at 21:33

Friday, Mar 14, 2003 at 21:33
I thought it was the other way around. They use salt to help melt ice, not stop it melting.Be good, or be quick.
Rohan
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Reply By: GaryInOz - Friday, Mar 14, 2003 at 21:22

Friday, Mar 14, 2003 at 21:22
A salt water ice block will freeze at a lower temperature depending on how much salt you add. The downside is it becomes liquid at a lower temperature as well and may "salt" the surrounding food.
AnswerID: 15218

Reply By: Eric - Friday, Mar 14, 2003 at 22:15

Friday, Mar 14, 2003 at 22:15
Jack.
THe bloke with the salt story, was he driving a triton and did he have a eperb straped to his belt? Eric.
AnswerID: 15224

Follow Up By: Jack - Friday, Mar 14, 2003 at 22:36

Friday, Mar 14, 2003 at 22:36
Hi Eric.

THe bloke with the salt story, was he driving a triton and did he have a eperb straped to his belt?

Yes ... and I think he was attracted to me wearing a huge sticker across my forehead which read "sucker" ..

But thanks for the replies .. I think I will just stick to straight ice.

Jack


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Follow Up By: ThePublican - Saturday, Mar 15, 2003 at 13:44

Saturday, Mar 15, 2003 at 13:44
Ozi rides again.
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Reply By: Hardy - Saturday, Mar 15, 2003 at 00:36

Saturday, Mar 15, 2003 at 00:36
Adding salt lowers the chemical potential of water giving a depresion of freezing point and elivation of boiling point. What that means is the ice will melt at a lower temperature, as such lowering the temperature of your eski. However you will use your ice up quicker maintaining this lower temp. So it doesn't really help your situation. Good for making an Ice/salt water slurry to intantly cool your coldie. Can get apprx -10 degrees by adding salt.
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Follow Up By: Jack - Saturday, Mar 15, 2003 at 07:19

Saturday, Mar 15, 2003 at 07:19
Hi Hardy:

OK, that explains it for me. Many thanks .....

Jack
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Reply By: Suzuki Viagra - Sunday, Mar 16, 2003 at 03:47

Sunday, Mar 16, 2003 at 03:47
Hardy explained it well - Ice (water) freezes at 0 degrees- Salt water at -18 Degrees. Putting Salt on ice melts it, but the conversion of ice to water requires energy.

In your bath of Ice and water, the energy to emlt the ice with salt on it comes from other water/ice and is absorbed as heat, cooling the nearby ice and water. Hence you can us this to temporarily reduce the ice temperature further (down to the potential maximum -18) - great for quick freezing or at least cooling down your beer quicker.

If you need to keep stuff frozen but don't have a freezer (and have a heap of ice) then it's a good trick to know too.

The ice is cooler - must stay frozen longer huh? Uhuh - The downside is that the ice now will thaw at -18 not 0 degrees.....

Dammit! nothing in life is free.

Another thing worth considering is that that water in the esky with your ice could save your life if you're broken down in the middle of no-where on a hot day. Drinking Salt Water will kill you really quick.

AnswerID: 15290

Reply By: Lloydy - Sunday, Mar 16, 2003 at 08:06

Sunday, Mar 16, 2003 at 08:06
Suzuki Viagra

With that answer I think you seriously need to get out more :)

Jack

I have heard the same theory never really tested it. Hate ice so I am going to buy a fridge.

I would be interested as to why it would have been suggested to anyone in the first place, is there something we don't know?



Lloydy

Off to Accessorise some more
AnswerID: 15293

Follow Up By: Jack - Sunday, Mar 16, 2003 at 08:24

Sunday, Mar 16, 2003 at 08:24
Hi Lloydy:

I have an Engel fridge and an ice box (and even an Esky) ... and depends on what sort of trip I do as to what I take (or all three) ....

Fridge (and often ice box) goes with me for long trips, esp where there is a lot of driving (think battery charging). Ice box goes on shorter trips where the vehicle is stationary for long periods (eg fishing, camping up to 4 or 5 days), Esky for a day/weekend trip, mainly due to size.

Ice question came when a guy was chatting to me recently on a fishing trip (an ice box trip) and suggested the use of salt and wrapping the block in newspaper. I was just curious and thought I'd ask.

My block ice usually lasts between 4 to 6 days in the cooler. I make ice on the road (in the fridge) on a long trip ... usually using a couple of bladders (wine cask type) filled with fresh water, then transfer the frozen bladder from the fridge to the ice box .. result is cold water/cold ice box along the way. Works fine for me ....
Cheers
Jack
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Reply By: Bob Y. - Sunday, Mar 16, 2003 at 09:40

Sunday, Mar 16, 2003 at 09:40
jack, Back around 1970, was at Kununurra races, and a keg was supplied at one of the camps, for consumption, for us young blokes, and a few others. The temprite used must have been home made because it was set up in one of those frail foam eskis. However, the beer was cold, and the ice in the eski/temprite didn't thaw one bit, it was covered in a few mm's of salt. That lasted like that until after the keg was finished, I'm sure, because I was finished long before the keg was! Hooroo...
AnswerID: 15301

Follow Up By: Jack - Sunday, Mar 16, 2003 at 11:15

Sunday, Mar 16, 2003 at 11:15
HI Bob:

Yep that figures .. a friend of mine (connected with the fishing industry) has contacted me privately as well to let me know that the professional fishing boats use a salt/ice slurry to freeze pilchards which are then scooped out and pressed into blocks for use by recreational fisherpersons (politically correct term, I think ...) throughout Australia as a preferred bait for pelagic fish.

No, I don't know what "pelagic" means .. this was part of *his* reply ...

Thanks, I appreciated your input.

Jack
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Follow Up By: Bob Y. - Sunday, Mar 16, 2003 at 15:20

Sunday, Mar 16, 2003 at 15:20
I didn't have a clue what it was either, Jack. Pocket Oxford says"of, on, in, the open sea." You learn something every day, eh. Hooroo...
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Reply By: relax - Tuesday, Mar 18, 2003 at 10:21

Tuesday, Mar 18, 2003 at 10:21
Fellows,
Pelagic in fishing terms mean fish that are not bottom feeders. Some of these fish include snapper, mackreal and tuna. As for the ice question. I do a lot of deep sea fishing here ( on great barrier reef) and we use salt a lot to bring the temperature of the fish down quickly and keep it in good condition. Yes, you do need a lot of ice, but for us getting the fish home and keeping it fresh for a few days is essential.
Hope I have enlightened you all.
AnswerID: 15470

Follow Up By: Jack - Tuesday, Mar 18, 2003 at 10:40

Tuesday, Mar 18, 2003 at 10:40
Thanks relax:

You are definitely in God's country up there .. I worked in Cairns for a few years and loved it. I sneak back every 12 months or so for a short stay.

Pelagic fish? Thank you .. I am now fully enlightened, and richer for the experience :) (Can't wait to roll that one out at the next party ....).

Take care, good fishing ....

Jack
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