Temperature is a measure of how warm or cold things are.
A red-hot pin is at a higher temperature than a kettle of boiling water
- although there's a lot more heat in the kettle. We measure temperature
in degrees, named after a scientist called Anders Celsius - degrees Celsius
Thermometers measure the degree of heat. They contain a liquid that expands
- swells - as it gets hotter. The tube of the thermometer holds in the
liquid, so that it pushes its way up the tube. You can read the temperature
from a specially made scale on the side.
Heat travels. But you can slow the movement of heat with a material called
an insulator. Air is a good insulator. Materials which hold a lot of air
- like thick woolly blankets - also slow the movement of heat. Materials
like this - good insulators - can slow the movement of heat out of something
- so we use oven gloves to protect our hands from the heat of a hot casserole
- and also into something - so wrapping ice cream in newspaper will slow
down the rate at which it melts.