It is a break between the end of a pipe and the point water can ' pool' , so the pipe can not siphon water up. - Most common place you should see this is the vent pipe on Hot water tank. It should end 1/2 inch above the pan or water drain.
"A physical separation which may be a low inlet into the indirect waste receptor from the fixture, appliance or device indirectly connected. "
water distribution system ===
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Removing any air in the system.
Of course they can
Because it is pretty well indestructible, does not break down or rust.
no, heating, venting, air condioning = hvac
Yes
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Hydronics / scorched air /vapor systems /
NOPE
it is a plumbing term for a funnel which provides an air break for something like a water heater which has a pressure relif valve. Discharge may sometimes be hot or cold water or steam. It allows the steam to escape
No, the Macbook Air does not break easily.