Concept explainers
Condensation of water vapor into clouds or fog requires
a. high temperatures.
b. storms.
c. condensation nuclei.
d. no wind.

Condensation of water vapor into fog or clouds requires:
high temperatures.
storms.
condensation nuclei.
no wind.
Answer to Problem 1AC
Solution:
Option (c) is correct.
Explanation of Solution
Introduction:
The transformation of water vapor into water is called condensation which is happened generally in the absence of temperature or close to the dew point. It depends upon the relative humidity of the air.
Explanation:
Reason for the correct option:
From the theory of condensation it is clear that the water vapor turns into water when it has no longer the capacity to hold the water droplets. The condition can reach at very low temperature or when the temperature is close to dew point. The dew point is the minimum temperature below which the condense can begin and dew can form.
Now the condensation begins at saturation point when it ceases the capacity of holding the water vapours, then the excess water vapours condenses into liquid form. Condensation requires small particles to absorb this water to form the condensation nuclei. If there are no condensation nuclei prasent then water vapor will condens to tiny droplets which will soon torn apart by collisions with other water vapor molecules. Thus, condensation nuclei are required for condensation process.
Hence, option (c) is correct.
Reason for the incorrect options:
Option (a) is incorrect because if the temperature is high then the condensation cannot take place. This is because it will hold the water vapors and the ability will be more with increase in the temperature. Thus condensation will not occur.
Option (b) is incorrect because in this case of storm the air is disturbed. But for the condensation to take place it must be in free, calm air. Any disturbance would cause the dust or the small particles to move which will not lead to condensation.
Option (d) is incorrect because if there is no wind then the small particles will be missed. Condensation must take place with the combination of absorption of excess water vapors by the small particles. If there is no wind, then condensation cannot take place.
Hence, options (a), (b) and (c) are incorrect.
Conclusion:
Condensation of water into fog or clouds requires, condensation nuclei.
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