Differences

This shows you the differences between two versions of the page.

--- basics:building_physics_-_basics:humid_air [2024/05/18 11:00] – wfeist
+++ basics:building_physics_-_basics:humid_air [2026/02/10 00:41] (current) – wfeist
@@ Line 7: / Line 7: @@
 |{{ :picopen:humid_air_03.png?600 |}}|A couple of molecules in the gas space then become slow enough again to return to the liquid.This is referred to as "condensation at the molecular level"|
 |{{ :picopen:humid_air_04.png?600 |}}|A steady-state equilibrium eventually results:the number of molecules leaving the liquid constantly is the same as those returning to it.|
-|{{ :picopen:humid_air_05.png?600 |}}|The water vapour volume which is then present in the gas space is called the saturation vapour volume.Its density is the saturation vapour density (at this temperature) and the pressure of the water vapour on the wall of the container is called the "saturation vapour pressure".|
+|{{ :picopen:humid_air_05.png?600 |}}|The amount of water vapour which is then present in the gas space is called the saturation vapour mass.Its density is the saturation vapour density (at this temperature) and the pressure of the water vapour on the wall of the container is called the "saturation vapour pressure".|
-Moisture/humidity is simply another word for water and is used when it is present in other substances mixed as water. We speak of air moisture (the amount of water vapour present in the air) or of material moisture (the water which is contained in microscopic empty spaces in a material called "pores"). Moisture - that is water - is present almost everywhere in our surroundings, usually in a beneficial proportion: neither too moist (which allows mould growth), nor too dry (which is not good for our mucous membranes). First it must be stated: **the relative humidity in the air in indoor spaces** that are occupied by humans should be within the range of **35 to 60% (( It just depends on an average value of over 1 to 2 h - shorter fluctuations can certainly be compensated by our bodies. Thus even if the relative humidity drops below 10% for a short time (e.g. during airing), this won't be a problem. Temporarily remaining in e.g. a bathroom with a higher level of air humidity is quickly compensated again.)) on average.** (It will be explained in this section what relative humidity actually is – many errors are based on a false understanding of relative humidity).
+Moisture/humidity is simply another word for water and is used when it is present in other substances. We speak of air moisture (the amount of water vapour present in the air) or of material moisture (the water which is contained in microscopic empty spaces in a material called "pores"). Moisture - that is water - is present almost everywhere in our surroundings, usually in a beneficial proportion: neither too moist (which allows mould growth), nor too dry (which is not good for our mucous membranes). First it must be stated: **the relative humidity in the air in indoor spaces** that are occupied by humans should be within the range of **35 to 60% (( It just depends on an average value of over 1 to 2 h - shorter fluctuations can certainly be compensated by our bodies. Thus even if the relative humidity drops below 10% for a short time (e.g. during airing), this won't be a problem. Temporarily remaining in e.g. a bathroom with a higher level of air humidity is quickly compensated again.)) on average.** (It will be explained in this section what relative humidity actually is – many errors are based on a false understanding of relative humidity).
 Let us start with water: for practical use, it is enough to know about the three states of matter of water. Solid in form like ice, liquid (as **liquid water** from the tap) and gas (**water vapour**).