What happens when ammonia gas is passed through the solution of hydrochloric acid?
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When ammonia gas react with hydrochloric acid there is production of white fumes of Ammonium Chloride (NH4Cl).

If the water vapor content stays the same and the temperature drops, then the relative humidity increases. its vise versa.if the water vapor content stats the same and the temperature rises, the relative humidity decreases. so, yes, i'd say that temperature and humidity have a strong relationship.