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Question
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.
Solution
- The ratio of actual mass of vapour content in the air for a given volume and temperature to that required to make the air saturated with vapour at that temperature is called relative humidity.
- The white trail is basically the vapour released by aeroplane engine condensing in sky to form a cloud.
- If the relative humidity of surrounding air is more then, we may get to observe this white trail at the back of the aeroplane flying high in the clear sky.
- If the relative humidity of surrounding air is less then, either small sized white trail may get formed or it may not get formed at all.
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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 ______.
Vapours in air condenses to form ______.
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 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?
How much is the relative humidity at the dew point?
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%.
