Thermometers are a type of things that we often use in our lives. They can accurately judge and measure temperature, and use solid, liquid, and gas to be inflated and contracted due to temperature. However, what is the principle of each thermometer? Next, I will introduce it to you:       The principle of the mercury thermometer is very simple - because the heat of the mercury rises and contracts, as for the water, because the water is at 4 degrees, the expansion and expansion of the water is also swollen, and the expansion coefficient of mercury is relatively large, and the change is more obvious. Alcohol, the red alcohol thermometer is suitable for measuring low temperature (-78~+110 degrees), mercury thermometer is suitable for higher temperature (about 15~300 degrees). There is also kerosene thermometer. There are some Industrial thermometer:       The principle of the pressure thermometer----based on the law of liquid expansion, that is, a certain mass of liquid, under the condition of constant volume, the pressure and temperature of the liquid are linear. The pressure and temperature of gas and steam also have a certain function, so the scale of the pressure thermometer should be evenly divided. The pressure thermometer consists of a warm pack, a pressure transmitting element (capillary) and a pressure sensitive element (spring tube) filled with a temperature sensitive medium.       Principle of Infrared Thermometer----Infrared thermometer consists of optical system, photodetector, signal amplifier and signal processing. Display output. The optical system converges the target infrared radiation energy in its field of view. The infrared energy is focused on the photodetector and converted into a corresponding electrical signal, which is then converted into the temperature value of the measured object.       The principle of thermocouple thermometer ----- The principle of thermocouple thermometer is to connect "current meter - copper wire - iron wire - copper wire" into a loop. At this time, the two ends of the iron wire and the copper wire joint will form. Two "junctions", if the temperatures at the junctions are different, produce a voltage between them, and the microamperometer measures the weak current flowing through the wires and copper wires. To use a thermocouple as a thermometer, the following calibration must be performed first. Put one joint into the ice water, put the other joint into the boiling water, and record the current intensity at this time. This is the current value when the temperature difference is 100 °C. For two known metal wires, the current value is proportional to the temperature difference between the two junctions, and the measurement range is large, that is, from -200 ° C to 1700 ° C, the sensitivity is high.       However, what is the principle of each thermometer? I believe that we have some understanding through the above introduction, I hope to bring you help. Grill and smoke the food in exceptional style with our bbq grill oven. Comprising a chrome-coated steel BBQ grill.portable grill oven also has perfectly sealed and thick metal body renders the Smoker excellent heat retention and heat distribution properties. Ensuring all the natural flavours and delights of your cooking are absorbed back into the meats for its delectable goodness. Furthermore, the air outlets provides good ventilation helps you to monitor cooking temperature for best results.Fireplace grid for grilling over the fire.Includes rack for logs and ash tray for simple cleaning.Can also be installed in brick barbecues. Grill Oven,Dutch Oven,Outdoor Oven,Barbecue Grill Oven MEO DEMO CO., LTD. , https://www.meobbqtools.com