Air Humidity Measurement: Difference between revisions
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== | == Measuring humidity overview == | ||
* [[Physical Principles]] | * [[Physical Principles]] | ||
**[[Physical_Principles#Dalton´s Law|Dalton´s Law]] | **[[Physical_Principles#Dalton´s Law|Dalton´s Law]] | ||
** [[ | ** [[Physical_Principles#Water Vapor Partial Pressure in the Air|Water Vapor Partial Pressure]] in the air | ||
* [[Measured Variables]] | * [[Measured Variables]] | ||
** [[Measured Variables#Dewpoint|Dewpoint]] | ** [[Measured Variables#Dewpoint|Dewpoint]] | ||
**[[Measured | **[[Measured Variables#Saturation Humidity|Saturation humidity]] | ||
** [[Measured | ** [[Measured Variables#Relative Humidity|Relative humidity]] | ||
** [[Measured | ** [[Measured Variables#Absolute Humidity|Absolute humidity]] | ||
** [[Measured | ** [[Measured Variables#Mixing Ration|Mixing ratio]] | ||
* [[Moisture | * [[Moisture Measurement Methods]] | ||
** [[Chilled Mirror Hygrometer]] | ** [[Chilled Mirror Hygrometer]] | ||
** [[Psychrometric Measuring Methods]] | ** [[Psychrometric Measuring Methods]] | ||
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** [[Hygrometric Measuring Methods]] | ** [[Hygrometric Measuring Methods]] | ||
*** [[Hygrometric_Measuring Methods#Hair Measuring Element|Hair Measuring Element]] | *** [[Hygrometric_Measuring Methods#Hair Measuring Element|Hair Measuring Element]] | ||
*** [[Hygrometric_Measuring Methods # | *** [[Hygrometric_Measuring Methods #Polymeric-fiber Measuring Element|Polymeric-fiber Measuring Element]] | ||
** [[LiCl | ** [[LiCl Condensation Hygrometer ]] | ||
** [[Electrolytic Hygrometer]] | ** [[Electrolytic Hygrometer]] | ||
** [[Infrared Hygrometer]] | ** [[Infrared Hygrometer]] | ||
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** [[Aluminium Oxide Sensor]] | ** [[Aluminium Oxide Sensor]] | ||
** [[Resistive Sensors]] | ** [[Resistive Sensors]] | ||
* [[Comparison of | * [[Comparison of Measuring Methods]] | ||
* [[Measuring Humidity in Practice]] | * [[Measuring Humidity in Practice]] | ||
== Introduction == | == Introduction == | ||
Air is a mixture of gases. The main | Air is a mixture of gases. The main ones are summarized in Table 1. In addition to these, air always contains a small amount of water, which exists in three states of matter: | ||
*solid: ice, hail, snow | *solid: ice, hail, snow | ||
*liquid: rain, fog, dew | *liquid: rain, fog, dew | ||
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{|border="2" cellspacing="0" cellpadding="4" width="40%" align="left" class="wikitable sortable" | {|border="2" cellspacing="0" cellpadding="4" width="40%" align="left" class="wikitable sortable" | ||
|+''Table 1: Composition of | |+''Table 1: Composition of air'' | ||
|- | |- | ||
|bgcolor = "#F0F0F0"|'''Gas''' | |bgcolor = "#F0F0F0"|'''Gas''' | ||
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Water is the only gas in the atmosphere that is present in its three states | Water is the only gas in the atmosphere that is present in its three states, gas, liquid and solid. For buildings, this leads to some undesirable phenomena such as condensation, corrosion and frost. | ||
Both temperature and humidity are the main parameters needed to describe ambient conditions and both influence our well-being significantly. | |||
[[category:Climate Measurement]][[category:Humidity Measurement]][[category:Schwarz,Hans-Jürgen]][[category:R-SLaue]][[category: | [[category:Climate Measurement]][[category:Humidity Measurement]][[category:Schwarz,Hans-Jürgen]][[category:R-SLaue]][[category:approved]] | ||
Latest revision as of 19:59, 22 December 2013
Author: Hans-Jürgen Schwarz
English Translation by Sandra Leithäuser
back to Climatic measurements
Measuring humidity overview
- Physical Principles
- Dalton´s Law
- Water Vapor Partial Pressure in the air
- Measured Variables
- Moisture Measurement Methods
- Comparison of Measuring Methods
- Measuring Humidity in Practice
Introduction
Air is a mixture of gases. The main ones are summarized in Table 1. In addition to these, air always contains a small amount of water, which exists in three states of matter:
- solid: ice, hail, snow
- liquid: rain, fog, dew
- gas: water vapor
| Gas | Symbol | Content in Vol. % |
| Nitrogen Oxigen Argon |
N2 O2 Ar |
78 21 0,8 |
| Krypton Xenon Neon Helium Hydrogen Carbon dioxide Methane Ozone |
Kr Xe Ne He H2 CO2 CH4 O3 |
Trace gases |
Water is the only gas in the atmosphere that is present in its three states, gas, liquid and solid. For buildings, this leads to some undesirable phenomena such as condensation, corrosion and frost. Both temperature and humidity are the main parameters needed to describe ambient conditions and both influence our well-being significantly.