I. Short Answer Questions 1. What determines the amount of water vapour in the air? 2. How is relative humidity determined? 3. Name four chief forms of condensation. 4. Mention the different forms of precipitation. 5. What do you understand by "condensation nuclei? 6. State the three types of rainfall. 7. What is cyclonic rainfall? -
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Answer:
1.The maximum amount of water vapor that can be in the air depends on the air temperature. Warmer air can hold more water vapor within it. That's why the muggiest days usually happen at the height of summer heat. But as the temperature goes down, the air can hold less vapor and some of it turns into liquid water.
2.Just like water vapor, relative humidity can be expressed in terms of pressure or density. In both cases it is expressed as a percentage and is calculated by dividing actual vapor pressure by saturation vapor pressure (or actual vapor density by saturation vapor density), then multiplying that number by 100.
3.Condensation | Forms of Condensation: Dew, Fog, Frost, Mist | Types of Clouds.
4.Rain. Most commonly observed, drops larger than drizzle (0.02 inch / 0.5 mm or more) are considered rain. ...
Drizzle. Fairly uniform precipitation composed exclusively of fine drops very close together. ...
Ice Pellets (Sleet) ...
Hail. ...
Small Hail (Snow Pellets) ...
Snow. ...
Snow Grains. ...
Ice Crystals.
5.Condensation nuclei are tiny particles in the air on which water vapor condenses and they are the key to making clouds, fog, haze, rain, and other forms of precipitation. Condensation nuclei come in many forms.
6.Types of Rainfall
Convectional rainfall.
Orographic or relief rainfall.
Cyclonic or frontal rainfall.
7.Cyclonic or Frontal rain: This type of rainfall occurs when warm and cold air meets each other. Since warm air is lighter, it rises above the cold air. The rising air is then cooled beyond the saturation point resulting in heavy rainfall. Such rainfall lasts only for few hours
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