High Quality Content by WIKIPEDIA articles! Magnetic evaporative cooling is a technique for lowering the temperature of a group of atoms. The process uses a magnetic field to put atoms in a magnetic trap, a flask-shaped magnetic field. Collisions mean that over time, individual atoms will become much more energetic than the others, and they will escape the trap, removing energy from the system and reducing the temperature of the group remaining. This process, where particles by collision surmount a barrier, is similar to the familiar process by which standing water becomes water vapor. A way to visualize this is to take a bowl and fill it almost all the way up with popcorn. Then shake the bowl enough so that the bouncing isn't enough to spill over the side. Every so often one of the popped corns will jump out, "evaporating" from the bowl

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