1. Saturated (cloudy) air at a temperature of 20 °C (68 °F) has a relative humidity of _________%.
2. Compute the relative humidity (RH) to nearest percent for each of the following atmospheric conditions:
a. vapor pressure = 6 mb, saturation vapor pressure = 18 mb, RH = __________ %
b. mixing ratio = 4.5 g/kg, saturation mixing ratio = 9.0 g/kg, RH = __________ %
c. mixing ratio = 12.0 g/kg, saturation mixing ratio = 12.0 g/kg, RH = __________ %
3. Outdoors, the air temperature is 5 °C (44 °F) and the relative humidity is 70%. What is the relative humidity of the air if it is drawn indoors and heated to 20 °C (68 °F)? Assume that no water vapor is added to or removed from the air. (This is the situation with heating homes in the winter season.)
4. If the relative humidity is 68% and the vapor pressure is 16 mb, what is the vapor pressure at
Answer: _________ mb
What is the approximate saturation air temperature? Answer: _________ °C.
5. On a clear and calm day, the air temperature at sunrise is 5 °C (41 °F) with a relative humidity of 90%. The air temperature reaches a maximum of 15 °C (59 °F) at 3 p.m. Assuming that no water vapor is added to or removed from the air, predict the value of the relative humidity at 3 p.m.
Answer: _____ %
I took the test from a Meteorology class so here's the correct answers:
2.) a. 25%
4.) a. 24mb
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