why a vaccum is created in condenser

Answer Posted / c.reddi sankara

Sudden expansion of steam in the condenser space which is higher enough to drop the pressure below then atmospheric pressure is the cause to create negative pressure or vacuum.(And air pumps are also used to create vacuum).
As we know any gas will expand and cooled immediately in vacuum due to negative pressure.
Hence when the pressured steam expanded suddenly in in vacuum and cooled then the cycle efficiency will increases.

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