Prickly heat is a skin rash caused by excessive heat or humidity. The rash is made up of raised, red, pinpoint spots. The surrounding skin also becomes red. Prickly heat occurs especially in areas of...
Heat Exhaustion – Hepatitis
Heat exhaustion is one of the body's reactions to overheating and inadequate fluid intake. It usually occurs during strenuous exercise when sweating makes the body lose too much water. Heat...
An oven that stays cool
Could you bake a potato in an oven that doesn't get hot? Yes, you could, if it's a microwave oven. In minutes, the potato gets steaming hot, but the oven stays cool! And the glass or china dishes you...
Heat-savers
What kinds of materials can be used to slow down heat? You can use your refrigerator to make an easy test. Make sure there is enough room in the bottom of the freezing compartment in your...
How does a picnic cooler work?
What kinds of food can you take on a picnic? Any kinds you like---hot baked beans, steaming cocoa, chilled potato salad, or ice- cold lemonade. You can put the food in a picnic cooler, or in special...
Taking out heat
Just a few minutes after you put warm food in a refrigerator, the food feels cooler. But the air inside the refrigerator doesn't feel warmer. What happens to the heat? The heat doesn't disappear....
Little blocks of water
Why does lemonade get cooler when you put ice cubes in it? The answer may surprise you. The lemonade cools down because it heats up the ice! Ice cubes are a solid---little blocks of frozen water....
As warm as toast
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....
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...
Speeding up molecules
Can you fry ice cubes? You can try---but if you heat ice cubes in a pan, they won't be ice cubes any more. The ice will melt into water. And, after a while, the water will boil and turn into steam....
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