HOT OR COLD?
Before thermometers were invented, everyone judged how hot or cold something was by the way it felt. The following simple experiment shows how unreliable this method.
Take three glasses. Fill one with very hot water, another with ice water, the third with water at room temperature. Put a finger of one hand in the hot water, a finger of the other hand in the cold. Hold them there for about a minute. Then use the two fingers, one at a time, to test the temperature of the glass of water at room temperature. This water will feel warm to the finger that has been in cold water, but quite cool to the finger that has been in hot water.
Judging subjectively (by personal reaction) rather than objectively (by scientific measurement) is one of the commonest causes of error. When you are in a hurry to get somewhere in a car, doesn?t the traffic seem to move with annoying slowness? But when you are out for a Sunday drive, what a rush everyone else seems to be in!
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