Hot Gel
Hot Gel
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US $1.56
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Copco Sierra Cold Tumbler, 24-Ounce Capacity The Sierra Tumbler focuses on the eco conscious cold beverage consumer with an iconic shape that is on trend and very functional. The classic iced coffee cup becomes a reusable everyday cup for all cold beverages. Quarter-turn lid sealing mechanism. Reusable straw included. Hot pink... |
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Vesture Hot Pack-Replacement Microcore Pac for Casserole Carriers $11.99 Easily heated in your microwave. Safer than gel; filled with non-toxic liquid Distributes the heat evenly Extremely durable FDA-approved Flexible outer film can withstand over one ton of pressure! Can be placed in any type of container for continued heating This is for 1 heating pack only- cooling pack sold seperately!... |
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PackIt Freezable Lunch Bag Nice, large size to carry multiple bottles or expressed milk. Choice of fun colors to fit your personality. Also perfect lunch bag for school, work, the field or anywhere else you plan to snack. Thanks to its patented eco-gel liner, PackIt keeps your contents cooler, longer. No need for bulky ice packs. No need for ice that quickly melts. Simply store PackIt in your freezer until you're ready to... |
In a hot gel, how does the flexing of metal plate cause the chemical reaction?
"A heat pack like the one you are describing contains sodium acetate and water. It turns out that sodium acetate is very good at supercooling. It "freezes" at 130 degrees F (54 degrees C), but it is happy to exist as a liquid at a much lower temperature and is extremely stable. Clicking the disk, however, has the ability to force a few molecules to flip to the solid state, and the rest of the liquid then rushes to solidify as well. The temperature of the solidifying liquid jumps up to 130 degrees F in the process.
When you boil the solid, you melt it back to the liquid state. You have to completely melt every crystal, by the way, or the liquid will quickly re-solidify. You can repeat this cycle forever, theoretically, just as you can freeze and melt water as many times as you like. The plastic pouch eventually wears out and leaks, though (since sodium acetate is a food additive, it is non-toxic)."
