Which thermometer records the highest and lowest temperature during a period of time ?

The thermometer that records the highest and lowest temperature during a period of time is called a Maximum-Minimum Thermometer.

Here are the steps on how it works:

1. The Maximum-Minimum Thermometer is a type of thermometer that contains two different types of alcohol: one for measuring the maximum temperature and one for the minimum temperature.

2. The alcohol in the thermometer expands or contracts when the temperature changes.

3. When the temperature rises, the alcohol expands and pushes the maximum temperature indicator to the right.

4. When the temperature falls, the alcohol contracts and the minimum temperature indicator is pulled to the left.

5. The maximum and minimum temperatures are recorded and can be read even after the temperature changes.

6. To reset the thermometer, you tilt it to the side, which allows the alcohol to reset and the indicators to return to the current temperature.

This way, the Maximum-Minimum Thermometer can record the highest and lowest temperatures during a certain period of time.