humidity and dew point
Download
Skip this Video
Download Presentation
HUMIDITY AND DEW POINT

Loading in 2 Seconds...

play fullscreen
1 / 11

HUMIDITY AND DEW POINT - PowerPoint PPT Presentation


  • 110 Views
  • Uploaded on

HUMIDITY AND DEW POINT. Humidity. amount of water vapor in the air. Specific Humidity. ACTUAL amount of water vapor in the air at a given time and place Units - g of water vapor / Kg of air. Saturated Air At a steady temperature the amount of water vapor is at it’s peak (maximum)

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' HUMIDITY AND DEW POINT' - edan


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
humidity
Humidity
  • amount of water vapor in the air
specific humidity
Specific Humidity
  • ACTUAL amount of water vapor in the air at a given time and place
    • Units - g of water vapor / Kg of air
  • Saturated Air
    • At a steady temperature the amount of water vapor is at it’s peak (maximum)

Rate of condensation = Rate of evaporation

    • Dependent on air temperature
      • Higher the air temp. - greater the amount of water vapor in the air
      • Water vapor in air doubles every 10°C
dew point
Dew Point
  • The temperature at which air is cooled to become saturated and condensation begins
  • More water vapor in the air
  • Less the air has to cool
  • Higher the Dew Point

weather.stives-town.info

relative humidity
Relative Humidity
  • Comparison of the specific humidity and the maximum amount of water vapor that the air can hold at a given temperature and pressure
    • UNIT - %

Relative humidity = specific humidity X 100%

maximum capacity

100% Rel. Hum. – saturated air

0% Rel. Hum. – dry air

psychrometer
Psychrometer
  • Instrument to measure humidity
  • Dry bulb – measures air temp.
  • Wet bulb – has a water soak wick around the bulb – water evaporates – cools the air
psychrometer1
Psychrometer

Dry air - greater evaporation

- greater cooling

- greater the difference in the 2 temperatures

High humidity – no evaporation (saturated air)

- temperatures of the 2 bulbs will be the same or very close

evaporation question
Evaporation question

Why do you feel so hot and sticky on hot, humid days in the summertime?

answer
Answer

High humidity means air has a lot of water vapor in it. Your body sweats but the water has no where to go so it stays on your body and you feel sticky and aren’t cooled by the evaporation of the sweat.

ad