Collisions of clusters or small particles with surrounding atomic particles determine the character of interaction of clusters with the gas or plasma in which they are located. Hence, parameters of this interac
Air pollution is made up of many kinds of gases,droplets(小水滴)and particles(小颗粒)that reduce the quality of the air. Air can be polluted in both the city and the country.In the city, buses and airplanes, as well as industry may cause air pollution. In the country, dust from tract...
Usually, air pollution on subways is not as harmful as that on streets, because subway pollution is mostly made up of small particles (颗粒) from wheels and they are not very harmful to health.It is true that we can do something to protect ourselves from polluted air, but the most ...
Because the particles in a gas are so widely distributed across the volume, the gas can be compressed with little difficulty. A liquid has a fixed volume and cannot be easily compressed because the particles are packed more tightly together. Like a gas, however, a liquid has no fixed shape....
Brownian motion refers to the random motion of particles as they collide with fluid particles. A dust particle of mass 2.15 × 10-17kg is suspended in air whose temperature is 308 K. Determine the root mean square speed of its Brownian motion. ...
【题目】Air pollution is made up of many kinds of gases, droplets (小水滴) an d particles that reduce the quality of the air. Air can be pol lute d in both the city an d the country.In the city, cars, buses an d airplanes, as u ell as industries may cause air pollution. In ...
The drying or dehydration process is known to collapse the interlayer space of expandable clay minerals, which are then not accessible to inert gases such as N2. In addition, electron microscopy suggests that air-drying of soil samples results in the collapse and shrinkage of soil humic acid, ...
In the adsorption of polar molecules on an adsorbent whose surface contains ions or dipoles, the adsorbate dipole interacts with the electrostatic field of the adsorbent. When the adsorbate molecules are small with a peripheral dipole distribution (e.g. water and ammonia molecules), they are orient...
Volcanic gases are insidious and often overlooked hazards. The effects of volcanic gases on life may be direct, such as asphyxiation, respiratory diseases and skin burns; or indirect, e.g. regional famine caused by the cooling that results from the prese
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