Freezing salt water

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Post Options Post Options   Likes (0) Likes(0)   Quote Mc Tool Quote  Post ReplyReply Direct Link To This Post Posted: 06 Dec 2023 at 3:59pm
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Originally posted by Kandrew Kandrew wrote:

Salt ice lasts longer, the salt lowers the freezing point of the water, allowing the water to freeze to a lower temperature.
Tongue yeah but LOL its the temp thats important  not the state LOL freezing point is as cold as you can get water,  so the fresh ice is colder , and any how it may be ( bet it is ) that salt water has a higher specific heat capacity (Geek) than fresh water  regardless of its freezing point,  which would be beneficial .
LOL but anyhow I think it mostly bull5hit LOL, that Matt Watson theory sounds about right , I mean   not like him to get excited about anything Ermm
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Post Options Post Options   Likes (0) Likes(0)   Quote smudge Quote  Post ReplyReply Direct Link To This Post Posted: 07 Dec 2023 at 10:46pm
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Originally posted by Mc Tool Mc Tool wrote:

Originally posted by Kandrew Kandrew wrote:

Salt ice lasts longer, the salt lowers the freezing point of the water, allowing the water to freeze to a lower temperature.
Tongue yeah but LOL its the temp thats important  not the state LOL freezing point is as cold as you can get water,  so the fresh ice is colder , and any how it may be ( bet it is ) that salt water has a higher specific heat capacity (Geek) than fresh water  regardless of its freezing point,  which would be beneficial .
LOL but anyhow I think it mostly bull5hit LOL, that Matt Watson theory sounds about right , I mean   not like him to get excited about anything Ermm

Are you saying that ice can get colder than freezing point or that water can't get colder than freezing point? 

I once had a discussion with the self proclaimed expert at everything about the temperature of ice. according to him it would get no colder than zero degrees (fresh water ice). I disagreed Big smile
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Post Options Post Options   Likes (0) Likes(0)   Quote Pcj Quote  Post ReplyReply Direct Link To This Post Posted: 07 Dec 2023 at 11:05pm
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Originally posted by smudge smudge wrote:

Originally posted by Mc Tool Mc Tool wrote:

Originally posted by Kandrew Kandrew wrote:

Salt ice lasts longer, the salt lowers the freezing point of the water, allowing the water to freeze to a lower temperature.
Tongue yeah but LOL its the temp thats important  not the state LOL freezing point is as cold as you can get water,  so the fresh ice is colder , and any how it may be ( bet it is ) that salt water has a higher specific heat capacity (Geek) than fresh water  regardless of its freezing point,  which would be beneficial .
LOL but anyhow I think it mostly bull5hit LOL, that Matt Watson theory sounds about right , I mean   not like him to get excited about anything Ermm

Are you saying that ice can get colder than freezing point or that water can't get colder than freezing point? 

I once had a discussion with the self proclaimed expert at everything about the temperature of ice. according to him it would get no colder than zero degrees (fresh water ice). I disagreed Big smile
Doesnt antartic ice get to -57c or colder? it is salt water after all as no rain fall to make fresh water ice.

Have had salt ice last in a standard chilly bin 4 days,by then its water but still cold.   
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Originally posted by smudge smudge wrote:

Originally posted by Mc Tool Mc Tool wrote:

Originally posted by Kandrew Kandrew wrote:

Salt ice lasts longer, the salt lowers the freezing point of the water, allowing the water to freeze to a lower temperature.
Tongue yeah but LOL its the temp thats important  not the state LOL freezing point is as cold as you can get water,  so the fresh ice is colder , and any how it may be ( bet it is ) that salt water has a higher specific heat capacity (Geek) than fresh water  regardless of its freezing point,  which would be beneficial .
LOL but anyhow I think it mostly bull5hit LOL, that Matt Watson theory sounds about right , I mean   not like him to get excited about anything Ermm

Are you saying that ice can get colder than freezing point or that water can't get colder than freezing point? 

I once had a discussion with the self proclaimed expert at everything about the temperature of ice. according to him it would get no colder than zero degrees (fresh water ice). I disagreed Big smile
Enter Steps I presume?  On the other end of the scale, it's akin to saying boiling water cannot attain a temperature of > 100deg C.  I'm on your side smudge Hug
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Post Options Post Options   Likes (0) Likes(0)   Quote Tzer Quote  Post ReplyReply Direct Link To This Post Posted: 08 Dec 2023 at 5:28am
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Originally posted by smudge smudge wrote:

Originally posted by Mc Tool Mc Tool wrote:

Originally posted by Kandrew Kandrew wrote:

Salt ice lasts longer, the salt lowers the freezing point of the water, allowing the water to freeze to a lower temperature.
Tongue yeah but LOL its the temp thats important  not the state LOL freezing point is as cold as you can get water,  so the fresh ice is colder , and any how it may be ( bet it is ) that salt water has a higher specific heat capacity (Geek) than fresh water  regardless of its freezing point,  which would be beneficial .
LOL but anyhow I think it mostly bull5hit LOL, that Matt Watson theory sounds about right , I mean   not like him to get excited about anything Ermm

Are you saying that ice can get colder than freezing point or that water can't get colder than freezing point? 

I once had a discussion with the self proclaimed expert at everything about the temperature of ice. according to him it would get no colder than zero degrees (fresh water ice). I disagreed Big smile


Your getting quite technical in your old age smudge.
With ice especially salt ice you can lower the temp in your slurry to the point bywhere your fish can actually freeze solid,
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Post Options Post Options   Likes (0) Likes(0)   Quote smudge Quote  Post ReplyReply Direct Link To This Post Posted: 08 Dec 2023 at 6:01am
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Post Options Post Options   Likes (1) Likes(1)   Quote kimber7wsm Quote  Post ReplyReply Direct Link To This Post Posted: 08 Dec 2023 at 6:27am
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I needed something really cold, so added a heap of salt to fresh water. Freezing point was lowered significantly. When I measured the temp of my brew it was -17°C.
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Post Options Post Options   Likes (0) Likes(0)   Quote Mc Tool Quote  Post ReplyReply Direct Link To This Post Posted: 08 Dec 2023 at 7:55am
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Ice can indeed get colder than it's freezing point .....way colder . I can't see why it couldn't get to close to absolute zero. But water cannot get colder than it's freezing point ( and that can vary a bit like the boiling point) after that its solid ice .
Similarly water cannot be heated above it's boiling point (100⁰c at sea level ....I think we have all been at sea level 😁), but we can mess with that as water boiling point is dependant on ambient pressure. Increase pressure and the boiling point goes up ( which is why we run pressurised cooling systems on our cars etc) boil a pot of water on top of Everest and it won't get near 100⁰c because atmospheric pressure is lower.
This manipulating of boiling points of liquids is how we get refrigerators to work. Some refrigerants boil at -40⁰c.
Anyhow 😁as far as practical for us fishers the freezing point of ice ,be it salt or fresh , probly makes feck all difference.
I have a 60l Coleman chilly bin and two bags of fresh ice ,days fishing ,left the Esky full of slurry on veranda and the last cube melted damn near a week later, thusly I have not bothered to get a lectric chilly bin , preferring to spend that money on various bottled (and canned ) liquids to put in said chilly bin.
Here is a hot tip .... don't let you bestie break up ice cubes with the boat knife.......stabbed a **** load of holes in my chilly bin liner🤬🤯
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Post Options Post Options   Likes (0) Likes(0)   Quote smudge Quote  Post ReplyReply Direct Link To This Post Posted: 08 Dec 2023 at 11:01am
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Originally posted by Mc Tool Mc Tool wrote:

Ice can indeed get colder than it's freezing point .....way colder . I can't see why it couldn't get to close to absolute zero. But water cannot get colder than it's freezing point ( and that can vary a bit like the boiling point) after that its solid ice .
Similarly water cannot be heated above it's boiling point (100⁰c at sea level ....I think we have all been at sea level 😁), but we can mess with that as water boiling point is dependant on ambient pressure. Increase pressure and the boiling point goes up ( which is why we run pressurised cooling systems on our cars etc) boil a pot of water on top of Everest and it won't get near 100⁰c because atmospheric pressure is lower.
This manipulating of boiling points of liquids is how we get refrigerators to work. Some refrigerants boil at -40⁰c.
Anyhow 😁as far as practical for us fishers the freezing point of ice ,be it salt or fresh , probly makes feck all difference.
I have a 60l Coleman chilly bin and two bags of fresh ice ,days fishing ,left the Esky full of slurry on veranda and the last cube melted damn near a week later, thusly I have not bothered to get a lectric chilly bin , preferring to spend that money on various bottled (and canned ) liquids to put in said chilly bin.
Here is a hot tip .... don't let you bestie break up ice cubes with the boat knife.......stabbed a **** load of holes in my chilly bin liner🤬🤯

Exactly. Ohh and my brand spanking 90l Icey Tek got a hole in it when a bat was used to break up a block of ice - one of the downsides of making your own ice i guess Big smile & I reckon Icey-Teks are way over rated Shocked
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Post Options Post Options   Likes (1) Likes(1)   Quote Reel Crusader Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 2024 at 7:54am
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Here's a copy of something I posted 10 years ago with a "recipe" on making salt ice at home to hit specific temperatures.....

"Here's some info from an Aussie chilly bin maker's website (www.xtracool.com.au) on making salt ice to keep your bin cool.  I haven't tried it yet but seems to make sense and they must have even greater challenges over there keeping their catch cool than us:

"5.What is the best way to use salt for keeping things cold?

Here is a tip for preparing ice that is very useful.
Water with salt dissolved (brine) has a freezing point below 0 C.

  • Check what is the temperature of your freezer.
  • Prepare water salt solution with freezing point 5 degrees higher.
  • Fill this into your containers, seal and freeze in the freezer. When filling leave some air in the container about 1/5 of volume to avoid blowing it up when freezing.

Then use them for your ice box. Because when the ice in these containers thaws at a temperature below 0 C it will keep your ice box cooler.

Use the following proportions:

  • Freezer temp -20
  • Brine freezing point: -15
  • Salt proportion: 22g for 100ml of water.
  • Freezer temp -15
  • Brine freezing point: -10
  • Salt proportion: 15g for 100ml of water.
  • Freezer temp -10
  • Brine freezing point: -5
  • Salt proportion: 8g for 100ml of water."
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