Your SlideShare is downloading. ×
  • Like
Humidity and temperature
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×

Now you can save presentations on your phone or tablet

Available for both IPhone and Android

Text the download link to your phone

Standard text messaging rates apply

Humidity and temperature

  • 435 views
Published

 

Published in Business , Technology
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Be the first to comment
No Downloads

Views

Total Views
435
On SlideShare
0
From Embeds
0
Number of Embeds
0

Actions

Shares
Downloads
21
Comments
0
Likes
1

Embeds 0

No embeds

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
    No notes for slide

Transcript

  • 1. Meteorology Temperature and humidity
  • 2. Water Vapor • Source of all condensation and precipitation • Most important gas in the atmosphere for understanding atmospheric processes • Zero to 4% by volume
  • 3. Water Changes State • Always requires heat • Heat is either absorbed or released • Water must pass through the atmosphere in the form of water vapor • If all the water vapor was in a global layer it would only be 2 mm deep
  • 4. Solid to Liquid • Melting – Heat is transferred to ice water – Temperature of the water remains a constant 0 degrees C until all ice has melted – Heat breaks apart crystal structure of ice forming liquid water
  • 5. Liquid to Gas • Evaporation – Changing a liquid into a gas – Requires 2500 joules of energy to convert 1 gram of liquid water to water vapor
  • 6. Liquid to Gas • “Evaporation as a cooling process” – Energy is needed to evaporate water – Cooling effect after getting out of the pool – Energy needed comes right from your skin • Condensation – Water vapor changes to liquid – Generates clouds and fog
  • 7. Solid to Gas • Sublimation – Conversion of solid directly to a gas – No liquid state – Dry ice (frozen carbon dioxide) – Generates “smoke” • Deposition – Conversion of vapor directly to a solid – Frost on cold objects, grass, windows
  • 8. Humidity • Humidity – the amount of water vapor in the air • Saturation – Balance between liquid water and water vapor – Closed jar: half water, half air – Water begins to evaporate  increases pressure in the air – Pressure is caused by more water vapor molecules moving into the air – Pressure in air continues to increase – Forces more water molecules to return to liquid – When a balance occurs, air is said to be saturated
  • 9. Saturated Air • Depends on temperature • Warm air contains more water vapor than cold air
  • 10. Relative Humidity • Ratio of air’s actual water vapor content compared to the amount of water vapor the air can hold at the time • How much water vapor can the air hold? – Depends on temperature and pressure • Indicates how near the air is to saturation
  • 11. Relative Humidity • How can it be changed? – 1 – adding or removing water vapor • Occurs naturally • Oceans and smaller bodies of water – 2 – varies with temperature • Lowering air temperatures causes INCREASE • Raising air temperatures causes DECREASE
  • 12. Dew Point • The temperature at which one parcel of air would need to be cooled in order to reach saturation • If the air was cooled further it would condense • This would cause dew, fog, clouds
  • 13. How do you measure humidity? • Hygrometer – used to measure relative humidity • Psychrometer – Two thermometers side by side – One is dry bulb, the other wet bulb – Larger the difference on the reading the lower the relative humidity – If air is saturated the thermometers will have the same reading