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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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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The animation shows 146 years of temperature in the contiguous United States, 1880 to 2025. Each year displays how far that year's average temperature was above or below the 1901–2000 average. The country then squeezes into a single bar and drops into the strip at the bottom, where it becomes that year's stripe, colored by the national average. By the end, the strip shows the whole record at once: mostly blues and pale tones through the first half of the 20th century, a mixed middle, then a run
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