What is the concentration of dust visible to the naked eye, and the dust visible to the naked eye in

The particle size of dust is the size of the dust particles, which is expressed by the diameter of the dust particle size, which is called particle size, and is often measured in millimeters or microns. According to the visibility and sedimentation of dust, dust can be divided into three categories: the first category is visible dust, whose particle size is greater than 10 microns, visible to the naked eye in strong light, accelerated or settled at equal velocity in still air; The second type is microscopic dust, which has a particle size of 10 microns and can only be seen under a microscope, in which dust particles with a particle size of more than 1 micron settle at a moderate rate in still air; The third category is ultramicroscopic dust, which has a particle size of less than microns, in an electron microscope.

It can be seen below, it is difficult to settle in the air and is suspended for a long time. In the case of poor underground lighting, sometimes 100 micron dust particles are not visible to the naked eye.

The quantity concentration of dust is determined by a counting dust meter, so that the dust in a certain volume of air is attached to the glass sheet, and then how many particles of dust on the glass sheet are read under the microscope, and finally the number of dust particles contained in the air equivalent to 1 cubic meter of air is calculated; Use cube centimeters.

Denote. The mass concentration of the dust.

It is the mass of dust in a unit of dust-containing air volume, expressed in milligrams cubic meters (1 gram is equal to 1000 milligrams). The determination of mass concentration is to make a certain volume of air filter the dust through the dust filter membrane, weigh the weight of the filter membrane before and after filtration, calculate the quality of the filtered dust, and finally calculate the dust mass equivalent to the content of 1 cubic meter of air. Since the filter membrane can filter out all dust particles of various particle sizes, the mass concentration determined by this method is the total dust concentration.

It is a bit larger than PM10 that can be seen with the naked eye.

Refers to particles in the atmosphere with a particle size of less than or equal to 2 m (sometimes less than PM10 is commonly referred to as PM10 with an aerodynamic equivalent diameter of less than 10 m

It is a bit larger than PM10 that can be seen with the naked eye.

What is the idea of concentration, mainly to see the efficiency of the purification equipment, the concentration also has a bearing on the purification efficiency, Wuxi Bodi's good, go to their official website to see what Liangyou.

According to the size and optical properties of dust particles, it can be divided as follows:

1 Visible dust It refers to dust with a particle size greater than 10 m and visible to the naked eye.

2 Microscope dust It refers to dust with a particle size that is visible with an optical microscope.

3 Ultramicroscope dust It refers to dust that is smaller in size and visible under the electron microscope.

Particle size dust needs to be seen under a light microscope.

It should be nm3, which is read as standard cubic meter, standard cubic meter or standard meter. Refers to the volume of gas at 1 standard atmosphere at 0 degrees Celsius.

The emission standard is the "Comprehensive Air Emission Standard" GB16297-1996. The comprehensive emission standards for air pollutants stipulate the emission limits of 33 kinds of air pollutants, and at the same time stipulate various requirements in the implementation of the standards. It came into force on January 1, 1997.

This standard is applicable to the management of air pollutant emissions from existing pollution sources, as well as the environmental impact assessment, design, completion and acceptance of environmental protection facilities of construction projects, and the management of air pollutant emissions after they are put into operation. After the implementation of this standard, the national air pollutant emission standards for industries will no longer be implemented according to the pollution sources specified in the scope of application.

Refers to particulate matter in the atmosphere that is less than or equal to a micron in diameter, also known as particulate matter that can enter the lungs. Although it is only a small component of the Earth's atmosphere, it has important implications for air quality and visibility. The particle size is small, rich in a large number of toxic and harmful substances, and the residence time in the atmosphere is long, and the transportation distance is long, so it has a greater impact on human health and atmospheric environmental quality.

Invisible, too small. Usually what we see is not.

Indicates the amount of dust in the air and is invisible.

It refers to microns, and its diameter is less than 1 20 of the thickness of a human hair, so it is invisible to the naked eye.