Even so, at room temperature, a cubic meter weighs 1.18 kg. Although the mean free path between collisions is 60 nm, air molecules travel at an average speed of 500 m/s at room temperature so that each one experiences 8.3 × 109 collisions per second! It is the force with which the ...
Using a decibel meter, we measured how loud the air purifiers are at their low, medium and high fan settings. This is particularly important if you plan on having your air purifier on in your bedroom overnight and you don't want it to disrupt your sleep. We performed this test in our...
removing pollutants out of the air using two to three filters. Air purifiers typically feature a pre-filter, a HEPA filter that can catch 99.97 percent of particles that are as small as 0.3 microns, and a carbon filter for capturing odor-causing molecules. ...
Air monitors,designed to sample PM10 concentrations,are concentrated in regions where exceedances are most likely to occur. If any one of those 154+monitors records a 24-hour average concentration over the state standard(50 micrograms per cubic meter [µg/m3]), then the air basin in which ...
In addition to oxygen, nitrogen, and other gases, each breath contains small amounts of particulate matter, trace elements, as well as soluble and volatile molecules. As some of these have bioactive properties, is it possible that an alternate source of nutrients has been literally right under ...
Measuring the airborne particle level before and after installing the cascaded filter system we describe here, and obtaining actual counts of airborne dust particles per cubic meter of air, we found at least an order of magnitude reduction in the dust level in the building. When we compared befo...
On the night side of the moon, where the temperature is considerably cooler, molecules take six times as long to diffuse across the same area. Since any given molecule will spend six times as long on the night hemisphere as on the day hemisphere, the gas reservoir on the night side will...
PM2.5 particulates are much more dangerous (they're less than 2.5 millionths of a meter or about 40 times thinner than a typical hair). In cities, most particulates come from traffic fumes. [11] Ozone: Also called trioxygen, this is a type of oxygen gas whose molecules are made from ...
After each breathing experience, the volunteers donated blood samples 24 hours later. Researchers examined the volunteers’ blood plasma -- the liquid component of blood that carries blood cells, proteins and other molecules throughout the body. Using a technology calledliquid chromatography–mass spectr...
Density of civil aircraft ρAC reflects the number of aircraft per cubic meter and per hour, which can be obtained using following equation. A total year’s data of Chinese domestic civil flights are used. (13) In (13), Ntotal is the total number of domestic civil flights taking off ...