Introduction to the price and types of thermometers

In the society where the economic level and scientific and technological level are rapidly improving, more and more necessities have appeared, which has brought great convenience to our lives. The weather and temperature in modern society vary greatly. If we can predict the temperature in advance, it will solve many unexpected problems for us. Thus, the thermometer came into being. Most of us have heard of thermometers before. They are usually similar to thermometers, but there are many differences. Next, I will introduce the thermometer to you in detail.

Thermometer price

Gas thermometers usually use hydrogen or helium as the temperature measuring material, because the liquefaction temperature of hydrogen and helium is very low, close to absolute? The temperature is zero, so it has a wide temperature measurement range. This kind of thermometer has high accuracy and is mostly used for precise measurement. Its market price ranges from a few yuan to dozens of yuan (source network, for reference only).

Types of thermometers

Rotating thermometer

The rotary thermometer is made of curled bimetal. One end of the bimetal is fixed and the other end is connected with the pointer. The expansion degree and temperature of the two metal sheets are different, which leads to the different curling degree of the bimetal. Then the pointer points to different positions on the dial, and its temperature can be known from the readings on the dial.

semiconductor thermometer

The resistance change of semiconductor is different from that of metal. When the temperature rises, its resistance decreases and changes greatly. Therefore, a small amount of temperature change can also make the resistance change obviously. The thermometer has high precision and is often called a temperature sensor.

thermocouple thermometer

A thermocouple thermometer consists of two different metals connected to a sensitive voltmeter. Metal contacts will produce different potential differences at both ends of the metal at different temperatures. The potential difference is so small that a sensitive voltmeter is needed to measure it. We can know what the temperature is from the reading of the voltmeter.

Thermal radiation pyrometer

If the temperature of an object is high enough to emit a lot of visible light, its temperature can be determined by measuring its thermal radiation. This kind of thermometer is called optical thermometer. This thermometer mainly consists of a telescope with a red filter and a set of circuits with a small bulb, an ammeter and a variable resistor. Before use, establish the relationship between the temperature corresponding to different brightness of filament and the reading on ammeter. When in use, aim the telescope at the measured object, and adjust the resistance so that the brightness of the bulb is the same as that of the measured object. At this time, the temperature of the object to be measured can be read from the galvanometer.

liquid crystal thermometer

The liquid crystals made of different formulations have different phase transition temperatures, and the optical properties will also change during phase transition, which makes 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.

Where can I buy a thermometer?

Ordinary thermometers for measuring indoor and outdoor temperatures can be bought in three places: stationery stores, hardware stores and local products and building materials stores.

In modern society, the material environment in which people live is getting richer and richer, and more and more people go out to play on holidays. Thermometers can help us know the local temperature and other information in advance, which is convenient for us to prepare for travel. In addition, smog and other weather will also affect our lives. Thermometers can not only measure the temperature, but also monitor the environment and measure the smog index, reminding us to carry masks with us. The thermometer is portable and suitable for us to use at any time. I hope everyone can have their own thermometer.

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