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  2. HC-12a - Wikipedia

    en.wikipedia.org/wiki/HC-12a

    HC-12a, also called ES-12a, OZ-12a, DURACOOL 12a [1] and Hydrocarbon Blend B, is marketed as a "drop-in" replacement refrigerant for R-12 and other refrigerants. HC-12a is a mixture of hydrocarbons, specifically propane (R-290) and isobutane (R-600a), and is therefore considered nearly non-ozone-depleting.

  3. Vapor-compression refrigeration - Wikipedia

    en.wikipedia.org/wiki/Vapor-compression...

    A representative pressure–volume diagram for a refrigeration cycle. Vapour-compression refrigeration or vapor-compression refrigeration system (VCRS), [1] in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely used method for air conditioning of buildings and automobiles.

  4. Airsoft gun - Wikipedia

    en.wikipedia.org/wiki/Airsoft_gun

    Classic Army M4 AEG with a replica Aimpoint CompM2 red dot sight Airsoft pellets. Airsoft guns are air guns used in airsoft sports. They are a special type of low-power smoothbore guns designed to shoot plastic pellets often colloquially (but incorrectly) referred to as "BBs", which are typically made of (but not limited to) plastic or biodegradable resin materials.