What is a Maximum-Minimum Thermometer?
A maximum-minimum thermometer is a type of thermometer that is used to measure the highest and lowest temperatures reached over a certain period of time.

How does it work?
- The thermometer consists of two separate liquid-filled tubes with a constriction in the middle.
- The liquid expands when the temperature increases and contracts when the temperature decreases.
- The liquid is pushed up into the upper tube when the temperature rises, indicating the maximum temperature reached.
- Conversely, the liquid is pushed down into the lower tube when the temperature drops, indicating the minimum temperature reached.

Usage of Maximum-Minimum Thermometer
- Maximum-minimum thermometers are commonly used in weather stations, greenhouses, and laboratories to monitor temperature fluctuations.
- They provide a convenient way to track temperature variations without the need for constant monitoring.

Advantages of Maximum-Minimum Thermometer
- Provides a record of both the highest and lowest temperatures.
- Eliminates the need for manual tracking of temperature changes.
- Offers a simple and reliable method for measuring temperature extremes.

Conclusion
In conclusion, a maximum-minimum thermometer is a useful tool for measuring the maximum and minimum temperatures experienced in a given period. Its design allows for easy monitoring of temperature fluctuations and provides a convenient way to track temperature variations.