The relative humidity in the evening at 16 ° C is 55%. Will dew fall if the temperature drops to 8 ° C at night?

Answer: dew will not fall out.
Explanation: To solve this problem, you need to use the formula:
f1 * p1 = f2 * p2, where f1 and f2 are relative air humidity at the beginning. and final temperatures (16 and 8 degrees, respectively), p1 and p2 are the saturated steam pressure at the corresponding temperature.
According to the reference table, we find: at 16 degrees: p1 = 1.81 kPa;
at 8 degrees: p2 = 1.06 kPa.
We substitute the values in the formula and get:
f2 = f1 * p1 / p2 = 0.55 * 1.81 / 1.06 = 0.94 = 94%.
Since f2 <100% there will be no dew