Calibrating a Thermometer

Wonderful animation on how to calibrate an alcohol-in-glass or mercury-in-glass thermometer.

http://www.absorblearning.com/media/attachment.action?quick=zn&att=2555

 

Questions:

1. How could you make this experiment more accurate?

2. How could you use this experiment to calibrate other types of thermometers?

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The Myth of the Boiling Point

We all learn at school that pure water always boils at 100°C (212°F), under normal atmospheric pressure. Like surprisingly many things that “everybody knows”, this is a myth. We ought to stop perpetuating this myth in schools and universities and in everyday life: not only is it incorrect, but it also conveys misleading ideas about the nature of scientific knowledge. And unlike some other myths, it does not serve sufficiently useful functions.

There are actually all sorts of variations in the boiling temperature of water. For example, there are differences of several degrees depending on the material of the container in which the boiling takes place. And removing dissolved air from water can easily raise its boiling temperature by about 10 degrees centigrade.

To continue reading this article, go to the article on the University of Cambridge website here