MadSci Network: Physics |
Dear Allison, Believe it or not, the only way ice can melt is by taking in heat from somewhere else. "Heat" can appear to take many different forms depending on where it is on something called the Electromagnetic Spectrum. That's a fancy term for something that's kind of like what a rainbow is like. The light you see from the sun is white because it is made up of many colors, but when it goes through a prism, it comes out all different colors because the prism separates them. Red is at one end and violet is at the other, kind of like notes on a piano. Each one is a different frequency, but they are all energy. Red would be the low notes and violet the high ones. Things that are white reflect energy, and things that are black absorb energy. Snow reflects the energy of the sun and stays cold like Antarctica, while the black asphalt of a road absorbs it and gets hot. I thought of an experiment you might try. Get three small, inexpensive white styrofoam coolers like you would use for a picnic. You will also need to get some Saran Wrap, and a piece of tarpaper big enough to replace one of the covers. Fill each of the coolers with the exactly same amount of ice. Put the regular cover on one, use the Saran Wrap to cover the second one, and use the tarpaper to cover the third one. Make sure that the last two are tightly sealed around the top. First thing in the morning, put all three next to each other where the sun will shine on them equally all day. Take a peek at them every few hours, but remember to seal them back up tight, (duct tape works well for that). At the end of the day, measure how much water is at the bottom of the cooler. Let me know what happens. Good luck. Rick Becker
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