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Question
Drops of water can be seen accumulating on the glass of vehicles in the early hours of winter.
Solution
- When temperature of air at early hours in winter falls, air becomes saturated with vapour.
- As a result, the excess vapour condenses on surface of objects in the form of dew.
- When the dew settles on a glass of vehicles, drops of water accumulating on glass can be seen.
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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 ______.
Relative humidity greater than 60% : humid air : : relative humidity less than 60% : _______
What is a dew point temperature?
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 |
The dew point temperature does not depend on the amount of vapor in the air.
Humidity relative to dew point temperature is 100%.
The unit of absolute humidity is kg/m3.
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.
Write a short note.
Dew point temperature
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?
Differentiate between: Absolute humidity and relative humidity.
How do we feel about air in each of the following conditions?
- Relative humidity is more than 60%.
- Relative humidity is less than 60%.
