functions of maximum and minimum thermometers:

1. Maximum Thermometer:

   • A maximum thermometer is designed to record the highest temperature reached since its last reset.
   • Unlike traditional thermometers that require continuous monitoring, the maximum thermometer automatically retains the peak temperature until manually reset.
   • Here’s how it works:
     • Bulb and Capillary Tube: The maximum thermometer consists of a glass bulb connected to a narrow capillary tube. The bulb contains a liquid (often mercury or colored alcohol) that expands and contracts with temperature changes.
     • Index: Inside the capillary tube, there’s a small index (usually a constriction or break in the liquid column). As the temperature rises, the liquid expands and moves past the index. When the temperature decreases, the liquid contracts, leaving the index at the highest point reached.
     • Scale: The capillary tube is marked with a temperature scale (such as Celsius or Fahrenheit) for easy reading of the recorded maximum temperature.
   • Applications: Maximum thermometers are valuable for weather forecasting, industrial processes, and scientific research where continuous observation isn’t practical.

2. Minimum Thermometer:

   • While maximum thermometers record the highest temperature, minimum thermometers track the lowest temperature over a specific period.
   • The working principle is similar:
     • As the temperature rises, the index is pushed up the tube, remaining in position to show the maximum temperature reached.
     • Conversely, as the temperature falls, the lower index is pushed down the tube, indicating the lowest temperature.