* Absolute Zero: The lowest possible temperature is -273.15 degrees Celsius, known as absolute zero. At this temperature, all molecular motion theoretically stops.
* Kelvin Scale: Scientists use the Kelvin scale, where 0 Kelvin is equivalent to -273.15 degrees Celsius. This scale starts at absolute zero and has no negative values.
* Practical Limits: Most thermometers are designed for a specific temperature range relevant to their application. For example, a clinical thermometer measures body temperature, which is typically around 37 degrees Celsius.
Why you might see a thermometer with a low reading:
* Calibration: Some thermometers might have a scale that extends beyond -273.15 degrees Celsius, but this is simply a matter of calibration. The readings below absolute zero are meaningless and don't represent actual temperatures.
* Marketing: A thermometer with a very low reading scale might be marketed as "professional" or "advanced," but it's important to understand that this doesn't mean it's capable of measuring temperatures below absolute zero.
In summary, thermometers can't measure temperatures below absolute zero (-273.15 degrees Celsius). Any readings below this point are incorrect and meaningless.
