How are these able to be solved?The Dew Point is the temperature at which a mass of cooling air reaches reaches 100% humidity. In a case like that, any further cooling will cause condensation (or deposition if below 0oC) of the water vapor into liquid (or solid) water. Because of that, in a cooling mass of air that has reached the dew point, Relative Humidity will remain at 100% while the specific humidity decreases.Example:Suppose that we have a temperature of 35oC (purple line below).At that temperature, Saturation Specific Humidity (SSH) is 35gH2O/kg Air.If the Specific Humidity (SH) happens to be 10gH2O/kg Air (red line below),then the Relative Humidity (RH) would be 10/35 x 100% = 28.6%.If the temperature decreases to 25oC (pale green line),then the SSH would now be 20gH2O/kg Air.Since SH is still 10gH2O/kg Air, the RH would now be 10/20 x 100% = 50.0%.At 20oC (dark blue line),SSH is now 14gH2O/kg Air,and RH is 10/14 x 100% = 71.4%.At a temperature of 15oC (yellow line),SSH is now 10gH2O/kg Air (the same as the SH)and as a result, RH is now 10/10 x 100% = 100%This temperature (where the RH reaches 100 % due to cooling) is known as the Dew Point.Any further cooling will cause the SSH to drop below the old SH, which will require some of the water vapor to condense.At 5oC (dark green line),the SSH has dropped to 5gH2O/kg Air.Since there HAD been 10gH2O/kg Air of water vapor present,half of that has to condense (in the form of dew, fog, rain, etc.)leaving 5gH2O/kg Air of water vapor,and the RH will STILL be 5/5 x 100% = 100%.At 0oC (orange line),SSH is now 3.5gH2O/kg Air.As a result, RH = 3.5/3/5 x 100% = 100% (still)and a total of 6.5gH2O/kg Air of the originally present 10gH2O/kg Air will have condensed.Notice that as temperature cools (from 35oC to 25oC to 20oC to 15oC),Specific Humidity did not change,the RH rose (from 28.6% to 50.0% to 71.4% to 100%)This will ALWAYS happen as temperature decreases, because of the relationship between saturation humidity and temperature. F Quiz: Humidity Calculations Qu Xedu/courses/458600/quizzes/1572637/take29Saturation Humidity (g H2O / kg Air)5040302010Moisture0-40 -30 -20-10 0 10Temperature (°C)1. If we start with a Specific Humidity of 10gH₂O/kg Air, what is the Dew Point?[ Select](You can get this from the above discussion)M (no subject) - ericaross307@g X20 30 402. If we start with a Specific Humidity of 40gH₂O/kg Air, what is the Dew Point?[ Select]003. If we start with a Specific Humidity of 35gH₂O/kg Air, what is the Dew Point?[Select]4. If we start with a Specific Humidity of 30gH2O/kg Air, what is the Dew Point?[ Select]5. If we start with a Specific Humidity of 25gH₂O/kg Air, what is the Dew Point?[Select]F6x | +2 ge.edu/courses/458600/quizzes/1572637/takefor29esF20+-40-301. If we start with a Specific Humidity of 10gH₂O/kg Air, what is the Dew Point?(You can get this from the above discussion)[Select]-202. If we start with a Specific Humidity of 40gH₂O/kg Air, what is the Dew Point?[ Select]14-10 0 10Temperature (°C)3. If we start with a Specific Humidity of 35gH₂O/kg Air, what is the Dew Point?[ Select]4. If we start with a Specific Humidity of 30gH₂O/kg Air, what is the Dew Point?[ Select]V5. If we start with a Specific Humidity of 25gH₂O/kg Air, what is the Dew Point?[Select]6. If we start with a Specific Humidity of 20gH₂O/kg Air, what is the Dew Point?[Select]7. If we start with a Specific Humidity of 15gH2O/kg Air, what is the Dew Point?[Select]20F38. If we start with a Specific Humidity of 5gH₂O/kg Air, what is the Dew Point?[ Select]20 30 409. If we start with a Specific Humidity of 3.5gH₂O/kg Air, what is the Dew Point?[Select]$10. If we start with a Specific Humidity of 2.5gH₂O/kg Air, what is the Dew Point?[ Select]F4%UF5F620F7

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Applications and Investigations in Earth Science (9th Edition)

9th Edition

ISBN:9780134746241

Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa

Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa

Chapter1: The Study Of Minerals

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How are these able to be solved?

The Dew Point is the temperature at which a mass of cooling air reaches reaches 100% humidity. In a case like that, any further cooling will cause condensation (or deposition if below 0^oC) of the water vapor into liquid (or solid) water. Because of that, in a cooling mass of air that has reached the dew point, Relative Humidity will remain at 100% while the specific humidity decreases.

Example:

Suppose that we have a temperature of 35^oC (purple line below).
- At that temperature, Saturation Specific Humidity (SSH) is 35gH₂O/kg Air.
- If the Specific Humidity (SH) happens to be 10gH₂O/kg Air (red line below),
- then the Relative Humidity (RH) would be 10/35 x 100% = 28.6%.
If the temperature decreases to 25^oC (pale green line),
- then the SSH would now be 20gH₂O/kg Air.
- Since SH is still 10gH₂O/kg Air, the RH would now be 10/20 x 100% = 50.0%.
At 20^oC (dark blue line),
- SSH is now 14gH₂O/kg Air,
- and RH is 10/14 x 100% = 71.4%.
At a temperature of 15^oC (yellow line),
- SSH is now 10gH₂O/kg Air (the same as the SH)
- and as a result, RH is now 10/10 x 100% = 100%
- This temperature (where the RH reaches 100 % due to cooling) is known as the Dew Point.
Any further cooling will cause the SSH to drop below the old SH, which will require some of the water vapor to condense.
At 5^oC (dark green line),
- the SSH has dropped to 5gH₂O/kg Air.
- Since there HAD been 10gH₂O/kg Air of water vapor present,
- half of that has to condense (in the form of dew, fog, rain, etc.)
- leaving 5gH₂O/kg Air of water vapor,
- and the RH will STILL be 5/5 x 100% = 100%.
At 0^oC (orange line),
- SSH is now 3.5gH₂O/kg Air.
- As a result, RH = 3.5/3/5 x 100% = 100% (still)
- and a total of 6.5gH₂O/kg Air of the originally present 10gH₂O/kg Air will have condensed.
Notice that as temperature cools (from 35^oC to 25^oC to 20^oC to 15^oC),
- Specific Humidity did not change,
- the RH rose (from 28.6% to 50.0% to 71.4% to 100%)
- This will ALWAYS happen as temperature decreases, because of the relationship between saturation humidity and temperature.