There are three kinds of temperature and humidity meters commonly used: 1.the electronic temperature and humidity meter determines the humidity according to the electrical conductivity of the humidity sensitive resistor or humidity sensitive capacitor at different humidity. 2. mercury or alcohol thermometer , the humidity is measured by a thermo...

The humidity forecast is mostly relative humidity, such as 100% here. 100% means that 100% of the water vapor can be contained in the air. If water vapor enters the air, it will condense into water. The upper limit of how much water vapor can be contained in the air is affected by temperature. The higher the temperature, the faster the water vap...

1. The humidity of 100% doesn't mean it's going to rain. Humidity is a physical quantity used to describe the amount of water vapor in the air. There are many ways to express air humidity, of which the most commonly used is the "relative humidity" in meteorology. So what is relative humidity? Let's think of air as a sponge. It can hold at most a...

Ultraviolet rays have the most obvious effect on the skin and eyes of the human body . The absorption of ultraviolet rays by the skin is related to its wavelength. The shorter the wavelength, the smaller the depth of penetration into the skin, the weaker the melanin deposition after irradiation, the longer the wavelength, the greater the depth o...

According to the different biological effects, UV is divided into four bands according to the wavelength: long-wave UVA, medium-wave UVB, short-wave UVC and vacuum wave UVD. The longer the wavelength, the stronger the penetration. UVA. The wavelength of long-wave UVA, is between 320nm and 400nm, which is also called long-wave black spot effect u...

UV advantages : 1) disinfection and sterilization; 2) promote bone development; 3) it is good for blood color; 4) it can occasionally treat some skin diseases; 5) it can promote mineral metabolism and vitamin D formation in the body. Ultraviolet disadvantages : 1) cause skin aging to produce wrinkles; 2) produce spots; 3) cause dermatitis; 4) ca...

Quartz clock movement jump seconds and sweep seconds are two forms, quartz clock movement jump seconds or sweep seconds which is better? The following is to introduce you to the quartz clock movement jump seconds and sweep seconds of the two forms, in order to facilitate your purchase. The second-jumping movement means that the second hand of th...

Quartz clock movement is a common movement variety of high-end watches on the market, many famous watches use quartz clock movement, after the quartz clock movement has been used for a period of time, it needs to be replaced, so that the clock can work better, the following is to introduce the replacement of the quartz clock movement, so that yo...

Quartz clock movement and mechanical movement are two ways of movement, both of which are more common forms of watch movement. Here is a comparative introduction of quartz clock movement and mechanical movement, so that you can choose a suitable watch movement. Quartz movement in the movement is more common, to put it bluntly, it is "simple, ant...

The full name of MDF is Medium Density Fiberboard. MDF is made of plant fiber as raw material, applied with urea-formaldehyde resin or other synthetic resin, and pressed under heat, pressure and pressure. Plates with a density in the range of 0.50-0.88g / cm3 can also be added with other suitable additives to improve the characteristics of the p...