Relative density is the ratio between water vapor present in a given volume of air compared to water vapor present at a saturated level at given pressure and temperature, so when the ratio comes to be 1 then it means Relative humidity is 100% saturated.
Question : Air is said to be saturated when -
Option 1: It contains the maximum content of water vapour.
Option 2: Its pressure is minimum.
Option 3: Its thickness is maximum.
Option 4: It blows over the barren land.
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