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Question
Write a short note.
Dew point temperature
Solution
- When unsaturated air (of specific volume) at a certain temperature is taken and its temperature is decreased, a temperature is reached at which the air becomes saturated with vapour. This temperature is called the dew point temperature.
- Relative humidity of air at dew point is 100%.
- Dew drops, condensation of water droplets on the surface of water bottle taken out from refrigerator are some visible examples of air having reached dew point temperature.
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RELATED QUESTIONS
The vapour content in the air is measured using a physical quantity called ____________.
Humid and dry nature of air depends on the ______.
What is a dew point temperature?
What does the existence of drops of water on the leaves of a tree in the morning indicate?
Match the columns.
| Column A | Column B |
| 1) Dry air | a) 4 °C |
| 2) Humid air | b) Relative humidity 100% |
| 3) Saturated air/Dew point temperature | c) Relative humidity below 60% |
| 4) Maximum density of water | d) Relative humidity above 60% |
| e) – 4 °C |
Humidity relative to dew point temperature is 100%.
The unit of absolute humidity is kg/m3.
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Write scientific reason.
During winter season, we may have observed a white trail at the back of the aeroplane flying high in the clear sky or sometimes it may not get formed.
Geeta observed a white trail at the back of aeroplane in a clear sky to answer the question from this incident given below.
- What will be the effect of relative humidity of the air surrounding the plane?
- What will be the effect of relative humidity of the air surrounding the plane is low?
- When the air is dry and humid?
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Differentiate between: Absolute humidity and relative humidity.
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- Relative humidity is more than 60%.
- Relative humidity is less than 60%.
