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April 18, 2025
Recently, Harvard researchers suggest that the human survival limit for wet-bulb temperature may be closer to 31°C instead of the widely accepted 35°C.
| Aspect | Dry Bulb Temperature (Tdb) | Wet Bulb Temperature (Twb) | Dew Point Temperature (Tdp) |
| Definition | Ambient air temperature measured without moisture influence | Temperature of adiabatic saturation using a moistened thermometer | Temperature at which air becomes fully saturated and water vapor condenses |
| Measurement Method | Standard thermometer shielded from moisture and radiation | Thermometer bulb wrapped in wet cloth, exposed to air flow | Ice-water method in a metal can or using a hygrometer |
| Relation to Humidity | Unaffected by humidity | Affected by humidity; lower Twb means lower humidity | Closer Tdp to Tdb means higher humidity |
| Values Compared to Others | Always higher than or equal to Twb and Tdp | Always lower than Tdb unless RH = 100% | Always ≤ Tdb; equal when RH is 100% |
| Psychrometric Chart | Appears as vertical lines (x-axis) | Appears as diagonal lines (upper-left to lower-right) | Lies on the saturation curve (leftmost edge) |
| Applications | Used to describe sensible heat or air temperature | Helps estimate relative humidity and comfort level | Indicates dew formation, humidity levels, and condensation risk |
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