Water in the atmosphere
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Water in the Atmosphere. Review: How does water get into the atmosphere?. Heat Energy. Heat Energy. Condensation. Clouds Rain Snow Sleet Hail. HUMIDITY. The amount of water vapor in the air. WARM air can hold MORE water than cold air. This is why . . . Hot August days feel “muggy.”

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Review how does water get into the atmosphere
Review:How does water get into the atmosphere?


Water in the atmosphere

Heat Energy

Heat Energy


Condensation
Condensation

  • Clouds

  • Rain

  • Snow

  • Sleet

  • Hail


Humidity
HUMIDITY

The amount of water vapor in the air



This is why
This is why . . .

  • Hot August days feel “muggy.”

  • Your skin dries out in the winter.

  • Phoenix is more comfortable than Orlando




Relative humidity
RELATIVE HUMIDITY

The % of water in the air compared to how much water the air could hold


Psychrometer
PSYCHROMETER

  • Tool used to measure relative humidity


Psychrometer1
Psychrometer

  • Dry bulb

  • Wet bulb

  • The DIFFERENCE between the 2 is used to calculate Relative Humidity


Steps to calculate relative humidity
Steps to calculate Relative Humidity:

  • Measure dry-bulb temperature

  • Measure wet-bulb temperature.

  • Subtract the two to determine the difference.

  • Use a relative humidity table to determine % of water vapor in the air.


Example
Example:

  • Dry = _____

  • Wet = _____

  • Difference = _____

  • Go to table: