1. Distinguish between absolute humidity and relative humidity.
2. Name the different forms of condensation and precipitation.
3. What is rain? Classify rainfall and explain convectional rainfall with a labelled diagram.
Answers
Answer:
What is Absolute Humidity?
Absolute humidity is the actual amount of water vapor present in the air, regardless of the temperature. More precisely, the absolute humidity is the ratio of mass of water vapor to the mass of dry air. The absolute humidity is also referred to as the humidity ratio, and is expressed in grams of moisture per cubic meter of air (g/m3). It is derived from the specific humidity and the density of the air. The absolute humidity is independent of the temperature. It is largely determined by the nature of the surface under the air mass. For example, if the water vapor in 1 cubic meter of air weighs 35 grams, the absolute humidity of the air is 35 g/m3.
2
Water vapor in the atmosphere is visible as clouds and fog. Water vapor collects with other materials, such as dust, in clouds. Precipitation condenses, or forms, around these tiny pieces of material, called cloud condensation nuclei (CCN). ... The most common types of precipitation are rain, hail, and snow.
3
what is rain ??
Within a cloud, water droplets condense onto one another, causing the droplets to grow. When these water droplets get too heavy to stay suspended in the cloud, they fall to Earth as rain. ... When it evaporates—that is, rises from Earth's surface into the atmosphere—water is in the form of a gas, water vapor.
classify rainfall ...
Rainfall intensity is classified according to the rate of precipitation, which depends on the considered time. ... Light rain — when the precipitation rate is < 2.5 mm (0.098 in) per hour. Moderate rain — when the precipitation rate is between 2.5 mm (0.098 in) - 7.6 mm (0.30 in) or 10 mm (0.39 in) per hour.
Convectional rainfall occurs when the energy of the sun heats the surface of the Earth, causing water to evaporate to form water vapour. When the land heats up, it warms the air above it. This causes the air to expand and rise. As the air rises, it cools and condenses. ... If this process continues, rainfall will occur.
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