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Answer Posted / venkatesh
Vacuum is created in condensor because in LPT turbine steam having less pressure after expansion so we need that steam to convert into water.So at 1 atm and 100 deg water will convert into steam.At lower temp we need to convert steam in to water so we used vacuum pump to create negative pressure.if we achived Ideally -1 vacuum then their is no loss of water but practically it is not possible max we can reach -0.9 vacuum.
concl:Vaccum is needed to convert low temp stm into water.
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