Materials Required:
l Outdoor thermometer
A cold day
Procedure:
- Dress properly and go outside on a cold day. Hold a thermometer in the air for a few minutes and when the mercury has settled, notice what the air temperature is.
- Next, slide the thermometer up your sleeve so that it rests against your skin. Again, wait a few minutes.
- Now, check the temperature. Your skin is much warmer than the air temperature. Can you explain why?
Your body stays the same temperature no matter what the outside temperature is. There are many chemical reactions going on inside you that produce heat and help to keep you warm, even on cold winter days. The source of this energy that keeps you warm is the food you eat!
