How can the relationship between relative humidity and dew point be understood?

Correct answer: सापेक्ष आर्द्रता अधिक होने पर हवा ओसांक के निकट होती है

Correct answer: A. Relative humidity tells us how close the air is to saturation at its current temperature. The dew point is the temperature to which air must be cooled, with its moisture content unchanged, for saturation and possible condensation to begin. When relative humidity is high, the air is already holding a large fraction of the maximum vapour it can hold at that temperature. Consequently, only a small amount of cooling is needed to reach the dew point, so the air temperature and dew-point temperature are close. When relative humidity is low, the gap between air temperature and dew point is generally larger because more cooling is needed before saturation. Option A correctly expresses this relationship. Option B is wrong because dew point is not always zero; it depends on the actual moisture content and can be above or below zero. Option C is wrong because dew point is directly related to moisture in the air. Option D is wrong because higher relative humidity makes condensation more possible after slight cooling, rather than impossible. A high dew point also indicates moist air, although dew point and relative humidity are different measurements. Memory cue: high relative humidity means a small temperature drop can reach the dew point.