2007-01-26 00:46:49 · 5 answers · asked by RJ 3 in Science & Mathematics ➔ Physics
There are a number of materials that change color with temperature. The general term for this phenomenon is called thermochromism. It was the basis of the mood rings that were a big fad in the 70's; today, you can get thermometers in the drug store that you put on your forehead and which then change color to indicate your temperature. Wikipedia has a decent article on the subject.
2007-01-26 01:14:34 · answer #1 · answered by Grizzly B 3 · 0⤊ 0⤋
Although it sounds stupid but, Water i.e. Ice is an Acid. So,when you touch Blue litmus paper with ice, it turns red.Or a tungsten filament(through which current is passing)changes from Red to White because of loss of temperature.
2007-01-26 09:01:18 · answer #2 · answered by ArindagR8 1 · 0⤊ 0⤋
There is an offer on the back of pop-tarts boxes right now for a plastic box to keep your pop-tarts in when you freeze them. The box changes colors when it reaches a certain temperature, and then, presumably, your pop-tarts are ready to eat.
Many toys change colors when warm or cold water is added to them. One of the earliest toys to do this was GIJoe's color-changing Zartan toy, which changed color in warm sunlight.
2007-01-26 08:58:22 · answer #3 · answered by brainiac5 2 · 0⤊ 0⤋
ZnO turns white from yellow
2007-01-26 08:59:15 · answer #4 · answered by The Potter Boy 3 · 0⤊ 0⤋
yes CuSO4.6H2O from blue to green
2007-01-26 08:55:43 · answer #5 · answered by kater al nada 2 · 0⤊ 0⤋