Loser. pak het dan ook een beetje slim aan.
Gooi de flesjes bier in een kom met water/ijs en zout, roer een paar min en voila, koud. ijskoud.
voor de geinteresserden onder ons:
quote:
The introduction of salt to the water creates a solution whose freezing point is lower than 0C. Pure water ice in that solution is no longer thermodynamically stable and so it melts. However, it takes energy to do that. The energy comes from the heat supply of the salt solution, and anything in contact with the salt solution (like a can of cold, refreshing, malt beverage), lowering the temperature. Water takes a lot of energy to change phases. If you can force a phase change by adding salt, then the increased melting rate of the ice means an increased heat-loss rate from anything in contact with the ice, as energy is consumed in the melting process.
If the background environment were held stable at the freezing temperature of the target salt-solution, then the salt and ice could coexist comfortably together with no melting, because there would be no energetic advantage to melting and refreezing. Salt solution melts ice only if there is a heat reservoir at a temperature above the freezing point of the salt solution.
[ Bericht 80% gewijzigd door fusionfake op 26-07-2008 02:43:32 ]
The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubt