If you spread cold butter on hot toast, the butter won't stay cold very long. Some of the heat from the toast passes into it. Soon the butter is warm, too---as warm as toast. Heat energy can spread....
A solid thermometer
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
How does a gasoline engine work?
When a gasoline engine runs, matter is changed from one form to another, and Liquid gasoline flows through a pipe from the tank to the engine. On the way, it passes through a special part that...
Matter forever!
After a log burns in a fireplace, only a few handfuls of soft ashes are left. Most of the matter in the log seems to be gone. But is it really gone? No! It has simply changed into other kinds of...
Making changes
You can change matter from one form to another by making molecules speed up and slow down. This project will show you how. A melting race Make sure the glasses are at room temperature. Put an ice...
