• Print
• Login

The Analogue World

Now the information is given in the form of an analogy! In other words, we use something that behaves in a similar way. Here are some examples.

The hour glass egg timer

The greater the time interval, the deeper the sand in the bottom of the egg timer.

The mercury-in-glass thermometer

The hotter it gets, the further the mercury moves up the tube.

The car speedometer

The higher the speed, the further round the dial the pointer moves. The problem is that you have to do some work to extract the data. In the case of the speedometer, and the thermometer, you have to work out where the pointer sits on the scale.

On the other hand, you can easily judge how the temperature of a body is changing by watching how quickly the mercury is moving along the tube.