What are the thermometers and the types of thermometers

What are the thermometers in life.

The types of thermometers are: mercury thermometers, electronic thermometers, and infrared thermometers. Mercury thermometer:

It is easy to use for testing using the principle of thermal expansion and cold contraction of mercury. The advantages are accurate measurement, high stability, and low cost. The disadvantage is that it takes a long time to measure body temperature, it is easy to break, and the mercury is harmful to the human body after breakage.

Suitable for underarm measurements. <

The types of thermometers are: mercury thermometers, electronic thermometers, and infrared thermometers. 1. Mercury thermometer:

Mercury thermometer is the use of mercury thermal expansion and contraction principle for temperature testing, which is very simple to use, and its advantages are accurate measurement, high stability, cheap; The disadvantage is that it takes a long time to measure body temperature, which is easy to break, and mercury can be harmful to the human body after breakage. Mercury thermometers are generally suitable for underarm measurements.

2. Electronic thermometer: The electronic thermometer is a definite relationship between resistance, current and temperature, and the temperature is displayed in the form of numbers. In addition, the electronic thermometer can be used to measure different parts without worrying about mercury contamination.

However, its disadvantages are that it is expensive to build, will be affected by the power supply of electronic components and batteries, and its stability is not as good as that of mercury thermometers.

3. Infrared thermometer: Infrared thermometer is to measure body temperature through infrared, this thermometer is fast to measure, easy to operate, and only needs one second to measure accurate body temperature from the ear. It is more suitable for people with serious illnesses, the elderly, infants and young children.

Thermometers are tools that can accurately judge and measure temperature, and there are types of thermometers, semiconductor thermometers, thermocouple thermometers, optical pyrometers, liquid crystal thermometers, digital thermometers, and mercury thermometers.

The most commonly used of these are digital thermometers and mercury thermometers, which use a temperature sensor to convert the temperature into a digital signal, and then display the temperature number through a display. The digital thermometer can quickly and accurately measure the highest value of human body temperature, and has the advantages of convenient digital reading, short measurement time, high measurement accuracy, and can remember and have prompt sounds.

Mercury thermometers are very simple to use and can also avoid errors with external remote thermometers.

Commonly used thermometers: thermometers, electronic thermometers, mercury thermometers, room thermometers, temperature and humidity meters, fish tank thermometers, baby bottle thermometers.

A thermometer is a tool that can accurately judge and measure temperature, which is divided into a pointer thermometer and a digital thermometer. Depending on the purpose of use, a variety of thermometers have been designed and manufactured.

1. Gas thermometer: hydrogen or helium is mostly used as a temperature measurement substance, because the liquefaction temperature of hydrogen and helium is very low, close to absolute zero, so it has a wide range of temperature measurement. This type of thermometer is highly accurate and is mostly used for precision measurements.

2. Resistance thermometer: It is divided into metal resistance thermometer and semiconductor resistance thermometer, which are made according to the characteristic of resistance value change with temperature. Metal thermometers are mainly made of pure metals such as platinum, gold, copper, nickel, and rhodium iron, phosphor bronze alloys.

Semiconductor thermometers mainly use carbon, germanium, etc. Resistance thermometers are easy to use and reliable, and have been widely used. It measures in a range of -260 to around 600.

3. Thermometer: It is a widely used temperature measuring instrument in industry. It is made by using the phenomenon of temperature difference electricity. Two different wires are welded together to form the working end, and the other two ends are connected to the measuring instrument to form an electrical circuit.

When the working end is placed at the measured temperature, when the temperature of the working end and the free end is different, an electromotive force will appear, so that there is a current passing through the loop. By measuring electrical quantities, the temperature of another place can be determined by using the temperature of a known place.

It is suitable for between two substances with a large temperature difference, and is mostly used for high temperature and low turbidity measurements. Some thermocouples can measure high temperatures up to 3000 degrees, while others can measure low temperatures close to absolute zero.