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Thermometer according to Galileo

In this thermometer, whose construction is said to go back to Galileo Galilei (1564-1642), there are spheres in a liquid - . The density of the liquid and the average density of the spheres are close together, whereby this average density of the spheres is different. There are small labels on the spheres with different temperatures.

At a certain temperature, e.g. at 22 °C, the densities are such that some of the spheres are at the bottom, i.e. the buoyancy force is smaller than the weight force. These are the spheres for temperatures lower than the ambient temperature - . Another part of the spheres is at the top. The buoyancy force is greater than the weight force. These are the spheres for a higher temperature than the ambient temperature.

If the temperature changes, the densities also change, because they depend on the temperature. Since it depends on the ratio of the densities whether a body sinks or rises, balls move downwards or upwards. The temperature can be read from the ball that is still floating at the top.

Use of thermometers

There are also thermometers that make use of the fact that special colours, called thermal colours, change colour at a certain temperature or give off light at a certain temperature - chemistry problem solver . This can be used for thermometers. Since such thermometers are the size of a postcard, they are also called postcard thermometers.

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