WHAT IS RELATIVE HUMIDITY? 💧 Every Deck & Engine examiner asks this - don't get confused! 👉 RELATIVE HUMIDITY (RH): It's the percentage (%) of water vapour ACTUALLY present in the air compared to the MAXIMUM amount the air can hold at that same temperature. Formula: RH = (Actual Vapour / Max Capacity) x 100% If RH = 100% = Air is fully saturated = Fog, dew, sweat will form! If RH = 50% = Air holds only half of what it can hold. Why is it critical at sea? FOR DECK: High RH = Cargo sweat & ship
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