There are several kinds of inhalers which allow people with asthma to lead active lives without fear of an attack. This video shows a metered dose asthma inhaler and spacer. These inhalers use a chemical propellant to push the medication out of the inhaler. The medication may be released by squeezing the canister or by direct inhalation.
Want to master Microsoft Excel and take your work-from-home job prospects to the next level? Jump-start your career with our Premium A-to-Z Microsoft Excel Training Bundle from the new Gadget Hacks Shop and get lifetime access to more than 40 hours of Basic to Advanced instruction on functions, formula, tools, and more.