Materials - cardboard - foil-and-paper candy wrapper - pencil - spool - tape Most thermometers you've seen probably use a liquid to measure temperature. But solids can be used to measure...
How a thermometer works
Is a pool full of ice water warm enough for swimming? Not for you! But for a penguin, it might be just right. You and the penguin have different ideas about how \"warm" the water is. You can easily...
Moving molecules
Here is a way to show that hot and cold molecules move at different speeds. A hot-and-cold contest Materials - bowls (2, large) - food coloring - medicine dropper - pan (bigger than bowl) -...
How hot is hot?
Which is hottest---ice cream, a glass of cool water, or a steaming-hot cup of chocolate? Of course, the chocolate is hottest. But it wouldn't be quite right to say that the ice cream and the water...
You’re getting warm
On a chilly day, there's an easy way to make your cold hands feel warmer. Rub them together---fast! Why does rubbing your hands make them warmer? You are made up of molecules, just like all other...
Hot and Cold
Hot and Cold Hot and Cold
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