fire alarm system, sprinklers; selective focus

A fire sprinkler system stores water under a certain pressure within its pipe lines. When sensors inside the sprinkler heads are triggered by the presence of heat and flames, the water is immediately released and the area is drenched.
Each sprinkler head has either a bulb or metal link that shatters when exposed to heat, breaking a tiny pin designed to hold the pressurized water in the pipes. Subsequently, the water forcefully gushes out of the sprinkler head to battle the flames.

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