Aerosols Research Paper

Aerosols Research Paper

1. (20) Define the following terms, including method(s) of generation, usual particle size range, and deposition in the respiratory tract:

a. Aerosols: Aerosols are stable suspensions of solids or liquid particles in air, these can be in the form of dust, fogs, mists, fibers, fumes, and smoke. Aerosols can vary in particle size, and due to the varying size of aerosols, they can be found in multiple areas of the respiratory tract. Aerosols are can be generated many different ways such as from a burning material, a liquid that is boiling, sand–blasting, sweeping, condensation, and evaporation.

b. Dusts: Dusts are a dry solid particulate matter that is chemically identical to its parent constituent. Dusts are generally created by a mechanical ... Show more content on Helpwriting.net ...Smaller particles with an AED of 1–5µm are captured here. The most common method of particulate accumulation in this area is due to sedimentation, air has slowed enough to allow particulates to settle.

The alveolar region consists of the lower lung area and gas exchange regions. The air velocity in these regions are very low, surface areas have increased while the size of conducting airways has greatly decreased. Particles trapped in these regions generally have an AED of less than 1µm.

The entire airway passage system acts like a large filter. As you enter the HAR where airways are large and velocity is high, mucosal cells and other filtration methods trap larger particles. As air continues to the final destination, air passages greatly increase, surface area increases, while size of these passages decrease in diameter, and air velocity greatly decreases. The decrease in size and velocity changes the general mechanisms for deposition where in the HAR it would largely be due to impaction, eventually it is reduced to sedimentation and diffusion. 4. (20) Metals are classified variously–according to molecular weight ("heavy metals"), according to chemical properties (periodic table), according to toxicology. Please do the

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