• Did you think of a question that could be studied, or make an observation that was interesting or unexpected? You should send it to the Question board!

1. Place a warm object -- a cup of coffee, your hand, a stone that has been sitting in the sunlight for a while -- on a table top for a few seconds. Remove it and then place the thermal sensing sheet where the object was. What do you observe? Does it matter which temperature-range thermal sensing sheet you use? How would the results be different if the object were cool, like a can of soda?
2. What is the smallest temperature difference that you are able to distinguish by looking at the thermal sensing sheet? What is the temperature range where the color changes a lot with a few degrees?

   If you touch the thermal sensing sheet, how long does it take to change color? How long does it take to return to its original color (note that the answer is rather different if it started out black, than if it started out with some color)
   -- if it is lying on the table top?
   -- if you wave it in the air?

In addition to sending your discussion of the questions, please write something in your journal about this question:
2. Comment on the directions provided on the CD and in the manual. How easy or difficult has it been for you to set up the materials according to the directions on the CD? In the manual? If there have been specific difficulties please discuss these in detail. If there are particular features that have been especially helpful, please comment on how and why.

If there is something that you don't understand about liquid crystals, Ask us!

This is the end of this section. (Check this box )   The next section is about thermal conduction.    --> Please note that the first activity of the next section involves a long wait -- you could set it up now, or plan when you will do it. <--