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Humidity

by Hannah

Humidity is the amount of water vapour in the air. Humidity makes the likelihood of precipitation, dew or fog. Although invisible, water vapour is always in the atmosphere.

High humidity makes people feel hotter in the summer. It reduces the effectiveness of sweating to keep the body cool. Humidity is related to the amount of moisture in the air.

Humidity can be measured in various ways, but the most usual is described as ‘relative humidity’. Warm air can hold more water vapour then cold air.

Air near the ocean or ground usually has more water in it than the colder air up high. A humidity of 100% means the moisture content of the air is maximum possible at any particular temperature.

The hotter the air, the more moisture it can hold. Water in the atmosphere exists in three main states. 1.water vapour 2.cloud droplets 3.liquid rain drops.

Humidity tells how much water the air is holding compared to how much it could hold at a certain temperature. The water is usually in the form of invisible droplets.

At 100 percent humidity, the air cannot hold any more water. The highest humidity often occurs on hot days, creating a muggy feeling.

When warm air comes in contact with a cold, dry surface, the water in the air condenses. Fog occurs when the air is saturated and the invisible water now becomes visible.



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