What is dust?

Answer 1

Dust consists of tiny solid particles carried by air currents. These articles are formed by a disintegration or fracture process, such as grinding, crushing, or impact. The Mine Safety and Health Administration (MSHA) defines dust as finely divided solids that may become airborne from the original state without any chemical or physical change other than fracture.

A wide range of particle sizes is produced during a dust generating process. Particles that are too large to remain airborne settle while others remain in the air indefinitely.

Dust is generally measured in micrometers (commonly known as microns).
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Dust is generated by a wide range of manufacturing, domestic, and industrial activities. Construction, agriculture, and mining are among the industries that contribute most to atmospheric dust levels.

In minerals processing operations, dust is emitted-
*When ore is broken by impact, abrasion, crushing, grinding, etc.
*Through release of previously generated dust during operations such as loading, dumping, and transferring
*Through recirculation of previously generated dust by wind or by the movement of workers and machinery
The amount of dust emitted by these activities depends on the physical characteristics of the material and the way in which the material is handled.

for more information visit this site http://www.osha.gov/SLTC/silicacrystalline/dust/chapter_1.html

Answer 2

Dust can be a lot of things, I have heard that most of the dust in your house is actually flakes of dry human skin. Kind of makes you want to break out the pledge, doesn't it ?

Answer 3

very fine but still visible to human eye is called dust. Normally we mean the fine particles of mud as dust but any fine particle could be called as dust for example gold dust, aluminium dust (used in fire works), why even we have what is known as dust tea ( it means the smallest fragmented tea leaf). In spite of all these literary meanings generally we use dust as something that shabbies our body face, hair , clothes etc which is usually nothing but the fine particles of the mud that gets stuck to what I mentioned before. Hope this answers your question otherwise please go to this site for more details:-http://education.yahoo.com/reference/dictionary/entry/dust

Answer 4

a large part of dust is dead human skin cells , particles of clothing, pollution, Bactria deification. Just to name a few of the contents of Dust.