This involves fixing known points and then marking a scale on a measuring instrument, between these fixed points. e.g. Dave finds some old mercury thermometers, but the scales have worn off over the years. He doesn't want to throw them away as they appear to work very well. He decides to calibrate them. Filling a beaker with ice and a little water, he lowers the thermometers into the mixture. Using a permanent marker, he marks a line on the thermometer to show the freezing point of water (0°C) Dave then boils a beaker of water and places the thermometers into it. Again he marks the level of the mercury in the tubes (100°C) Once cool, Dave carefully measures the distance between the marks, which is 20.0 cm.
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