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Definitions of Common Terms Applied to Inhaled Therapies for Asthma

  • Aerosol are solid or liquid particles suspended in a gas for treating asthma.
  • Atomizer is a device used to form a mist of fine droplets from a liquid for treating asthma. A high-velocity air jet passes over a liquid feed tube and draws liquid to the surface by the Bernoulli effect. The liquid is then propelled forward as a thin sheet from which it breaks up into droplets by shear-induced instability.
  • Dust is solid-particle aerosol formed by mechanical disintegration of a parent material, such as by crushing or grinding.
  • Fume is solid-particle aerosol produced by the condensation of vapors or gaseous combustion products.
  • Gas is state of matter distinguished from the solid and liquid states by (1) relatively low density and viscosity, (2) relatively great expansion and contraction with changes in pressure and temperature, (3) the ability to diffuse readily, and (4) the spontaneous tendency to distribute uniformly throughout any container.
  • Mist is liquid-particle aerosol formed by condensation or atomization for treating asthma.
  • Nebulizer is a device that turns liquid forms of medicine into fine mist that can be inhaled for treating asthma.
  • Powder is a solid substance in the form of tiny, loose particles for treating asthma.
  • Smoke is visible aerosol resulting from incomplete combustion; the particles can be solid or liquid.
  • Solution is homogeneous mixture of 2 or more substances; frequently a liquid solution for treating asthma.
  • Suspension is a mixture in which particles are suspended in a fluid and the particles are large enough that gravity causes the particles to settle for treating asthma.
  • Vapor is the gaseous state of substances that are normally in the liquid or solid state (at normal room temperature and pressure) for treating asthma.

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