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2. Self-contained breathing apparatus - Wikipedia

   en.wikipedia.org/wiki/Self-contained_breathing...

   Open-circuit industrial breathing sets are filled with filtered, compressed air. Typical open-circuit systems have two stage regulators. The first stage reduces the pressure from storage pressure of up to more than 300 bar to about 10 bar for supply to the second stage on the mask, which further reduces it to just above atmospheric pressure via a demand valve when the pressure drops on inhalation.

3. Evaporative cooler - Wikipedia

   en.wikipedia.org/wiki/Evaporative_cooler

   Porous pottery and coarse cloth maximize the area for evaporation. An evaporative cooler (also known as evaporative air conditioner, swamp cooler, swamp box, desert cooler and wet air cooler) is a device that cools air through the evaporation of water. Evaporative cooling differs from other air conditioning systems, which use vapor-compression ...

4. Public address system - Wikipedia

   en.wikipedia.org/wiki/Public_address_system

   The setup includes the mixing console for the sound engineer (operating interface with slide controls etc. on the rear) and also the power amplifiers with loudspeaker cables, not in the picture are only the loudspeaker systems distributed around the stage. A public address system (or PA system) is an electronic system comprising microphones ...

5. Air compressor - Wikipedia

   en.wikipedia.org/wiki/Air_compressor

   Air compressor supplies air into a nail gun.. An air compressor is a machine that takes ambient air from the surroundings and discharges it at a higher pressure. It is an application of a gas compressor and a pneumatic device that converts mechanical power (from an electric motor, diesel or gasoline engine, etc.) into potential energy stored in compressed air, which has many uses.

6. Primary life support system - Wikipedia

   en.wikipedia.org/wiki/Primary_Life_Support_System

   A portable life support system from the Apollo A7L suit, with its outer cover removed. A primary (or portable or personal) life support system (or subsystem) (PLSS), is a device connected to an astronaut or cosmonaut's spacesuit, which allows extra-vehicular activity with maximum freedom, independent of a spacecraft's life support system.

7. Amplifier - Wikipedia

   en.wikipedia.org/wiki/Amplifier

   Amplifier. A McIntosh stereo audio amplifier with output power of 50 watts per channel used in home component audio systems in the 1970s. [1] Amplification means increasing the amplitude (voltage or current) of a time-varying signal by a given factor, as shown here. The graph shows the input (blue) and output voltage (red) of an ideal linear ...