This isn't truly a science experiment, but I tagged it as one because I don't have another good category for it. :-) I'm a big fan of candles to make a room smell nice. It's fall, so I'm currently using a pumpkin spice candle. Instead of an open flame candle, I put the candle on a candle warmer which simply melts the wax and gives off a nice pumpkin spice smell. What's interesting with this candle that my kids have noticed, is the way in which the wax hardens. Instead of hardening into a flat surface, as my vanilla candle does, the pumpkin spice candles hardens with a hole in the center.
Why the hole? Honestly, I'm not sure. I assume it has something to do with the location/pattern of the heating element in the candle holder. This candle is taller than my vanilla candle that hardens with a smooth, flat surface. I need to check on the candle as it hardens, but each time I turn the candle off, I forget to check on it before it hardens! My kids thought it was cool, and I admit I find it cool too!
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