Timeline for Make icepacks for a coolbag/coolbox
Current License: CC BY-SA 3.0
9 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Aug 12, 2020 at 8:19 | comment | added | Hobbes | So warming up from -10 °C to +10 °C, if more of that range is spent in the liquid state it takes longer to get to the end temperature. | |
| Aug 12, 2020 at 8:00 | comment | added | Hobbes | Adam's right. The heat capacity of liquid water is twice as high as that of ice, so it takes twice the energy to warm up 1 l of water by 1° compared to 1 l of water ice. Adding antifreeze reduces the heat capacity by a small amount | |
| Aug 6, 2015 at 16:05 | comment | added | piojo | Dave is right. This solution will make it stay colder, and consequently it will melt faster. After all, energy transfer is roughly proportional to the difference between two temperatures. | |
| Jul 28, 2015 at 19:09 | comment | added | Adam Zuckerman | I don't understand it completely. It has something to do with the maximum amount of energy that can be stored in a particular state (plasma, gas, liquid, solid) and thermal conductivity. My understanding is that a material that is in either a gas or liquid state has better thermal conductivity than a solid. | |
| Jul 28, 2015 at 9:12 | comment | added | Dave | Physics is not my strongest subject. I don't really understand why a lower freezing point helps. If my freezer is at -10C and I put pure water in, the water will freeze at 0C and then go down to -10C. If I added antifreeze that makes the solution freeze at -5C it will still be at -10C when it has been in the freezer long enough. If anything wouldn't the antifreeze solution be better at absorbing heat quickly, whereas the water better at absorbing heat over a longer period? | |
| Jul 28, 2015 at 8:59 | comment | added | Dave | Would salt help? | |
| Jul 27, 2015 at 23:18 | history | edited | Adam Zuckerman | CC BY-SA 3.0 |
added 52 characters in body
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| Jul 27, 2015 at 23:13 | comment | added | Alexander | Great excuse for a vodka martini (or three) with lunch! | |
| Jul 27, 2015 at 23:05 | history | answered | Adam Zuckerman | CC BY-SA 3.0 |