Hot Gel
Hot Gel
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 4G iPhone 4 GEL SHELL COVER CASE PROTECTOR HOT PINK  US $.01
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 Woman Asics Gel Nimbus 12 White Silver Hot Pink Sz 75 US $89.99
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 Hot Pk Gel Silicone Skin Cover Case For LG GS505 Sentio US $1.99
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 Hot Pk Rubber Gel Silicone Skin Cover Case For HTC Aria US $1.99
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 Scentsations hot cocoa bonus 3 small shower gels US $9.00
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 NEW TPU GEL PROTECTOR SKIN CASE COVER for iPAD HOT PINK US $12.95
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Dream Supreme Plus 100% Gel Filled Pillows Just squeeze to believe. This set of two down-alternative Dream Supreme Plus pillows features 100% hypoallergenic gel fill for firm support. These superior quality pillows provide the softness of down and comfortable support for back, side, and stomach sleepers alike. The shell is made of a 370-thread-count, 100% mercerized cotton fabric with a floral jacquard pattern. The gel fill provides great ... |
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Prince Lionheart Hot and Cold Gel Pack $5.95 Hot & Cold Gel Pack Some like it Hot and some like it Cold! A unique, patented non-toxic gel that can be frozen, boiled or microwaved to provide hours of heat or cold.... |
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Hot Shot Ultra Clear Roach & Ant Gel Bait HG-95769 $11.99 2.5 OZ, Hot Shot Ultra Clear Roach & Ant Gel Bait.... |
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)."
