Home >
Community >
What is the relationship between water content (PPM) and relative humidity in the air?
Upvote
3
Downvote
+ Catalyst
Posted by
Neil Morrison
What is the relationship between water content (PPM) and relative humidity in the air?
[Reproduced] How to convert between absolute humidity PPMV and relative humidity%RH First, clarify the two concepts: Volume ratio: volume percentage v (p) refers to Under the condition of standard atmosphere), the ratio of water vapor occupied by water vapor in the wet air is expressed as percentage. PPM (V) \u003d E/(P-E)*1000000 Relatively humidity: The relative humidity of the humid air with pressure is P and the temperature is T, which refers to the molar score of water vapor (or actual water vapor in the given wet air. Pressure) The ratio of the Moore scores (or saturated water pressure) of the saturated water vapor on the surface of the same temperature T and pressure p is represented by percentage.
From the above concept, the volume ratio is the independent amount under fixed pressure and temperature; and the relative humidity sensor is the amount of pressure and temperature. The conversion between the two includes two parameters -pressure p and temperature T, similar to the conversion of hybrid ratio and relative humidity.
Conversion formula for relative humidity and hybrid ratio: uw \u003d {[(0.622+rw)*r]/[(0.622+r)*rw]}*100% where RW is RW is the place is RW is the RW is. The saturation mixing ratio corresponding to EW rw \u003d [. 622*fw (p, t) ew (t)]/[p-fw (p, t) ew (t)] Regulating the law Equivalent to the same pressure and the volume ratio at the same temperature After further transformation, the conversion relationship between the two can be calculated
The conversion of PPMV and relative humidity must be first. Calculate the saturated water vapor pressure corresponding to the temperature in this state (calculated by the procedure provided by me, the solution simplified formula:
water surface: logew \u003d (10.286t-2148.4909)/(T-35.85) [123) ] Ice surface: logei \u003d 12.5633-2670.59/t), and then, through the following formula calculations: ppmv \u003d [e/(p-e)]*1000000 When E far is less than p, the formula can be simplified to to to : ppmv \u003d [e/p]*1000000
After understanding the above calculation formula, it will be more convenient when using a humidity sensor for measurement.
[Reproduced] How to convert between absolute humidity PPMV and relative humidity%RH First, clarify the two concepts: Volume ratio: volume percentage v (p) refers to Under the condition of standard atmosphere), the ratio of water vapor occupied by water vapor in the wet air is expressed as percentage. PPM (V) \u003d E/(P-E)*1000000 Relatively humidity: The relative humidity of the humid air with pressure is P and the temperature is T, which refers to the molar score of water vapor (or actual water vapor in the given wet air. Pressure) The ratio of the Moore scores (or saturated water pressure) of the saturated water vapor on the surface of the same temperature T and pressure p is represented by percentage.
From the above concept, the volume ratio is the independent amount under fixed pressure and temperature; and the relative humidity sensor is the amount of pressure and temperature. The conversion between the two includes two parameters -pressure p and temperature T, similar to the conversion of hybrid ratio and relative humidity.
Conversion formula for relative humidity and hybrid ratio: uw \u003d {[(0.622+rw)*r]/[(0.622+r)*rw]}*100% where RW is RW is the place is RW is the RW is. The saturation mixing ratio corresponding to EW rw \u003d [. 622*fw (p, t) ew (t)]/[p-fw (p, t) ew (t)] Regulating the law Equivalent to the same pressure and the volume ratio at the same temperature After further transformation, the conversion relationship between the two can be calculated
The conversion of PPMV and relative humidity must be first. Calculate the saturated water vapor pressure corresponding to the temperature in this state (calculated by the procedure provided by me, the solution simplified formula:
water surface: logew \u003d (10.286t-2148.4909)/(T-35.85) [123) ] Ice surface: logei \u003d 12.5633-2670.59/t), and then, through the following formula calculations: ppmv \u003d [e/(p-e)]*1000000 When E far is less than p, the formula can be simplified to to to : ppmv \u003d [e/p]*1000000
After understanding the above calculation formula, it will be more convenient when using a humidity sensor for measurement.
Now that you ask this question, you may not read the book, then you can say that it is fine, and find out the saturated vapor pressure under the temperature by checking the table, find the content of the water during saturated state, and then take the humidity.
Now that you ask this question, you may not read the book, then you can say that it is fine, and find out the saturated vapor pressure under the temperature by checking the table, find the content of the water during saturated state, and then take the humidity.
How to convert between absolute humidity PPMV and relative humidity%RH
First, clarify the two concepts:
Volume ratio: volume percentage v (p) refers to Under the condition of standard atmosphere), the ratio of water vapor occupied by water vapor in the wet air is expressed as percentage. PPM (V) \u003d E/(P-E)*1000000
Relatively humidity: The relative humidity of the humid air with pressure is P and the temperature is T, which refers to the molar score of water vapor (or actual water vapor in the given wet air. Pressure) The ratio of the Moore scores (or saturated water pressure) of the saturated water vapor on the surface of the same temperature T and pressure p is represented by percentage.
From the above concept, the volume ratio is the independent amount under fixed pressure and temperature; and the relative humidity sensor is the amount of pressure and temperature. The conversion between the two includes two parameters -pressure p and temperature T, similar to the conversion of hybrid ratio and relative humidity.
Conversion formula for relative humidity and hybrid ratio:
uw \u003d {[(0.622+rw)*r]/[(0.622+r)*rw]}*100%
where RW is RW is the place is RW is the RW is. The saturation mixing ratio corresponding to EW
rw \u003d [. 622*fw (p, t) ew (t)]/[p-fw (p, t) ew (t)]
Regulating the law
Equivalent to the same pressure and the volume ratio at the same temperature
After further transformation, the conversion relationship between the two can be calculated
The conversion of PPMV and relative humidity must be first. Calculate the saturated water vapor pressure corresponding to the temperature in this state (calculated by the procedure provided by me, the solution simplified formula:
water surface: logew \u003d (10.286t-2148.4909)/(T-35.85) [123) ] Ice surface: logei \u003d 12.5633-2670.59/t), and then, through the following formula calculations:
ppmv \u003d [e/(p-e)]*1000000
When E far is less than p, the formula can be simplified to to to :
ppmv \u003d [e/p]*1000000
After understanding the above calculation formula, it will be more convenient when using a humidity sensor for measurement.
How to convert between absolute humidity PPMV and relative humidity%RH
First, clarify the two concepts:
Volume ratio: volume percentage v (p) refers to Under the condition of standard atmosphere), the ratio of water vapor occupied by water vapor in the wet air is expressed as percentage. PPM (V) \u003d E/(P-E)*1000000
Relatively humidity: The relative humidity of the humid air with pressure is P and the temperature is T, which refers to the molar score of water vapor (or actual water vapor in the given wet air. Pressure) The ratio of the Moore scores (or saturated water pressure) of the saturated water vapor on the surface of the same temperature T and pressure p is represented by percentage.
From the above concept, the volume ratio is the independent amount under fixed pressure and temperature; and the relative humidity sensor is the amount of pressure and temperature. The conversion between the two includes two parameters -pressure p and temperature T, similar to the conversion of hybrid ratio and relative humidity.
Conversion formula for relative humidity and hybrid ratio:
uw \u003d {[(0.622+rw)*r]/[(0.622+r)*rw]}*100%
where RW is RW is the place is RW is the RW is. The saturation mixing ratio corresponding to EW
rw \u003d [. 622*fw (p, t) ew (t)]/[p-fw (p, t) ew (t)]
Regulating the law
Equivalent to the same pressure and the volume ratio at the same temperature
After further transformation, the conversion relationship between the two can be calculated
The conversion of PPMV and relative humidity must be first. Calculate the saturated water vapor pressure corresponding to the temperature in this state (calculated by the procedure provided by me, the solution simplified formula:
water surface: logew \u003d (10.286t-2148.4909)/(T-35.85) [123) ] Ice surface: logei \u003d 12.5633-2670.59/t), and then, through the following formula calculations:
ppmv \u003d [e/(p-e)]*1000000
When E far is less than p, the formula can be simplified to to to :
ppmv \u003d [e/p]*1000000
After understanding the above calculation formula, it will be more convenient when using a humidity sensor for measurement.
More
VOTE
More
VOTE
More
VOTE