Ice ice baby

[AZZA]

Gazzas informative post reminded me that I have been meaning to post this question. I have read or heard that adding salt to your ice slurry will keep it going longer so if anybody knows the skinny on this or you want to share your ice slurry secrets speak now or forever hold your peice.

[Shrimpo]

Ive added salt to frozen milk bottles and ice cream containers and i think it lasts longer but i havnt used normal water for a while so probably havnt taken as much notice.

[bootyinblue]

Yep... its all true. Salt water has a lower freezing point than water with a normal PH level. I put a cup of salt in 2L milk bottles and freeze them in the freezer and they go rock hard and will stay cold for 2 to 3 days in a regular esky.

Ice slurrys work the same way and will drop the water temp down a few more degrees and hold it that way.

Quick bar room tip - if you want to win some money, get a glass of water with a couple of ice cubes in it, a tooth pick and a salt shaker together. Ask anyone to pick up an ice cube using whats there... pretty much impossible, unless you do it as follows. Place the toothpick over the top of the ice, count to 10, sprinkle some salt over the cube, count to 10, carefully lift up the toothpick and the ice cube will be attached.

Its just using the above salt theory in science. The toothpick melts a little furrow in the cube due to its temp, the salt drops the temp of the water again over the furrow, refreezing the water with the toothpick inside.

[Gazza]

I found that in your esky/fishbox add some sea water to your normal servo ice works too

Gaz

[Bri The Pom]

I asked the same question a while ago,it is true but i was told it must be rock salt you add to water.

[Feral]

Any salt will do it, the action of disolving the salt in to the water uses energy, IE Heat, dropping the temperature. Nitropril is the best salt to use, (drops a lot more temp than normal salt) but its a bit hard to get these days!

Used to do it all the time when camping out west. Only two draw backs, firstly you have to drink the stubbies within a few hours, it rusts the caps! Secondly there is this period between "happy and sozzled", where you forget to rinse off the tops before taking that first sip, but your still sober enough for the salt to taste bad!

[bootyinblue]

And the problem with drinking all the stubbies in 2 hours is what?????????

Just on servo ice too.... if you can buy it 2 days prior and fit it into your home freezer as its set atleast 12 degrees lower than the servo ones so will freeze it a lot harder. To save money, servos run about -4 whereas your home one is -18 or so.

[shortie]

you dont nescessarily have to use salt. It is commonly used because it it abundant and cheap.

Anything added to the water causes the same effect. Suger or alcohol.

[maxi]

headache id reckon booty ...

[maxi]

just ask shortie ..

[fishingnut]

Used to do it all the time when camping out west. Only two draw backs, firstly you have to drink the stubbies within a few hours, it rusts the caps! Secondly there is this period between "happy and sozzled", where you forget to rinse off the tops before taking that first sip, but your still sober enough for the salt to taste bad!

[dhess]

bootyinblue wrote:

Yep... its all true. Salt water has a lower freezing point than water with a normal PH level. I put a cup of salt in 2L milk bottles and freeze them in the freezer and they go rock hard and will stay cold for 2 to 3 days in a regular esky.

Ice slurrys work the same way and will drop the water temp down a few more degrees and hold it that way.

Quick bar room tip - if you want to win some money, get a glass of water with a couple of ice cubes in it, a tooth pick and a salt shaker together. Ask anyone to pick up an ice cube using whats there... pretty much impossible, unless you do it as follows. Place the toothpick over the top of the ice, count to 10, sprinkle some salt over the cube, count to 10, carefully lift up the toothpick and the ice cube will be attached.

Its just using the above salt theory in science. The toothpick melts a little furrow in the cube due to its temp, the salt drops the temp of the water again over the furrow, refreezing the water with the toothpick inside.

It is true except salinity has nothing to do with pH. pH refers to acidity, i.e. the amount of hydrogen or hydroxide ions in a solution. Specific gravity or TDS ( total dissolved solids) is a better measure.