Using the available references, if the dry bulb temperature is 92° and the wet bulb temperature is 85°, what is the relative humidity in a cargo hold?
• Using a psychrometric chart (dry bulb vs. wet bulb) to find relative humidity • Locating the dry bulb temperature on the bottom axis and moving vertically up • Finding the line for the wet bulb temperature and then identifying the nearest relative humidity curve
• What point do you get when you go straight up from 92°F dry bulb until you reach the diagonal line for 85°F wet bulb? • Once you’ve found that intersection point, which labeled relative humidity curve (percent) passes closest through that point? • Are you sure you’re following the correct set of diagonal lines for wet bulb temperature, not the ones for dew point or another variable?
• Confirm you started at 92°F on the dry bulb (bottom) scale and went straight up • Verify you are using the 85°F wet bulb diagonal (check the labels along the left/top edges) • Make sure you read the final value from the correct relative humidity percent curves (the smooth, gently curved lines labeled 10%, 20%, 30%, etc.)
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