Dew Point and Humidity
“Temperature: 20 ∘C,
Relative humidity: 100%”.
What is the dew point?
- Less than 20∘C
- More than 20∘C
- Can’t be said.
A glass contains some water at room temperature 200C. Refrigerated water is added to it slowly. When the temperature of the glass reaches 100 C, small droplets condense on the outer surface. Calculate the relative humidity in the room. The boiling point of water at a pressure of 17.5 mm of mercury is 200 C and at 8.9 mm of mercury it is 100 C.
The temperature and the dew point in an open room are 200C and 100C. If the room temperature drops to 150C, what will be the new dew point ?
The weather report reads, "Temperature 20^0 C : Relative humidity 100 %". What is the dew point ?
On a winter day, the outside temperature is 00 C and relative humidity 40 %. The air from outside comes into a room and is heated to 200 C. What is the relative humidity in the room ? The saturation vapour pressure at 00 C is 4.6 mm of mercury and at 200 C it is 18 mm of mercury.
A bucket full of water is placed in a room at 150 C with initial relative humidity 40 %. The volume of the room is 50 m3. (a) How much water will evaporate ? (b) If the room temperature is increased by 50 C, how much more water will evaporate ? The saturation vapour pressure of water at 150 C and 200 C are 1.6 kPa and 2.4 kPa respectively.