List thermometers commonly used in life and talk about their respective uses.

There are many kinds of thermometers, which are generally divided into the following types:

1. liquid crystal thermometer: liquid crystals made of different formulations have different phase transition temperatures. When they undergo phase transition, their optical properties will also change, making the liquid crystals look discolored. If liquid crystals with different phase transition temperatures are coated on a piece of paper, the temperature can be known from the change of liquid crystal color. The advantage of this thermometer is that it is easy to read, but the disadvantage is that it is not accurate enough. Often used to watch fish tanks, indicating water temperature.

2. Resistance thermometer: The resistance of metal will increase with the increase of temperature. When the temperature changes little, the resistance of the anemometer is linear with the temperature. In a large temperature range, it can usually be expressed by a simple quadratic polynomial. By measuring the resistance of metal, we can know what the temperature is. This kind of thermometer is usually made of platinum wire, which can be accurate to 10-3 degrees Celsius, and is often used for precise measurement. Because of the high melting point of platinum, the measurable temperature range is large, about -250℃ to 1200℃.

3. Gas thermometer: At a fixed pressure, the volume of low-density gas in laser range finder is linear with temperature. A thermometer made of this relationship is called a constant pressure gas thermometer. In a certain volume, the pressure and temperature of low-density gas are linear. A thermometer made from this relationship is called a constant volume gas thermometer.

4. Rotating thermometer: The rotating thermometer is made of curled bimetal.