It is a common knowledge that mercury expands when heated but to measure our body temperature, we need only to touch the bulb of the thermometer in which the mercury is kept.
When it senses our body temperature, the mercury expands over a scaled glass tube indicating our body temperature.
But now, there is a thermometer that measures temperature with out any contact. It is a Infra Red Thermometer.
It is capable of measuring temperatures from 20 to 4000 degrees C. It is a German Product.
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