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  • Workplace Health

  • Safety - usually associated with acute injuries, short-term, traumatic exposures

  • Health - usually directed at chronic exposures, persistent, prolonged, repeated

  • Definition

  • Industrial Hygiene - "that science and art devoted to the anticipation, recognition, evaluation, and control of those environmental factors or stresses, arising in or from the workplace, which may cause sickness, impaired health and well-being, or significant discomfort, and inefficiency among workers or among the citizens of the community"

  • Environmental Stresses

  • Chemical - environmental concentrations

  • Physical - noise, heat, ionizing, etc.

  • Ergonomic - man-machine interface

  • Biological - micro living organisms

  • States of Matter

  • Solids - definite shape and volume

  • Liquids - definite volume but no definite shape

  • Gases - neither definite volume nor shape

  • Chemical Stresses

  • Dusts - solid particles from handling, grinding, crushing, impact (1–25 microns) (cotton, grain, grinding wheels)

  • Smoke - carbon or soot particles less than .1 microns in size and are the products of incomplete combustion (fire, gas engines)

  • Fumes - solid particles generated by condensation from the gaseous state (welding, soldering, brazing)

  • Aerosols - solid particles or liquid droplets of fine enough size to remain dispersed in air for a prolonged period of time (powder sprays, paint sprays)

  • Mists - suspended liquid droplets generated by condensation of liquids, or by breaking up a liquid into a dispersed state (mixing vats, maintenance degreasers)

  • Vapors - volatile form of a substance normally a liquid or solid at STP (paint thinners, nail polish remover)

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