Atmospheric Moisture

The same amount of water is in a larger volume so

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Unformatted text preview: temperature rises. (The same amount of water is in a larger volume, so density decreases.) Relative humidity relates the amount of Atmospheric Moisture:2 RH water vapor in the air to the maximum amount that can be in the air at a particular temperature: RH = (amt. in air/max. amt.) x 100; multiplying it by 100 makes it a percentage. Since the maximum amount increases with temperature and since the maximum amount is in the denominator, there is an inverse relationship between relative humidity and temperature. If we follow relative humidity over a typical day, we find that it usually is highest at dawn, when the temperature is at its minimum and then decreases until sometime in the mid afternoon, when the temperature is highest. Then it rises until dawn again. The absolute humidity may stay the same, but the relative humidity varies with the temperature. The dew point is another measure of the water content of the air. For a given amount of water vapor in the air, there is a temperature at which the relative humidity will be 100%. This temperature is the dew point. This is a bit confusing–just remember that dew point is a temperature, but it really is a measure of the amount of water vapor in the air. As the dew point approaches the air temperature, the relative humidity increases. When the two are the same, the air is saturated. Mid. 6AM Noon 6PM Mid. Air can become saturated either by adding water vapor though more evaporation or by cooling the air or by some combination of the two. When you take a shower, you are adding water vapor to the air in the bathroom and you may...
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