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Condensation is the change of the physical state of aggregation (or simply state) of matter from gaseous phase into liquid phase and the reverse of evaporation..[1] When the transition happens from the gaseous phase into the solid phase directly, bypassing the liquid phase, the change is called deposition. While condensation can occur in many different substances, the condensation of water vapor in air is by far the most common experienced (such as the formation of dew on a cold drink).

Condensation commonly occurs when a vapor is cooled to its dew point, but the dew point can also be reached through compression. The condensed vapor is called a condensate, the laboratory or the industrial equipment used for condensation is called a condenser.

The science of studying the thermodynamic properties of moist air and the interrelationships between these in order to analyze, and predict properties by changing in the conditions of moist air is called psychrometry. The interrelationship can be graphically represented, and prediction carried out graphically by the psychrometric chart. Most people think the water is condensation, but condensation is only the process of change.

Water vapor that naturally condenses on cold surfaces into liquid water is called dew. Water vapor will normally only condense onto another surface when the temperature of that surface is cooler than the temperature of the water vapor.

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The message is simple and insightful: one piece of scientific data can describe two entirely differant perceptions. And when we truly believe in a perception, we see it as the one and only reality and ignore all other posible realities.

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Spontaneous Evolution



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veda_sticks said:

You obviously havnt seen the monotub that had a shit load of condensation yet only 86%rh.

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Condensation happens because of a differential in tempearute between the inside and outside. The surfaces of the walls will be slightly cooler and that allows moisture to condense out of the air, which happens regardles of RH. If theres moisture in the air, it can condesse out of the air.

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All condensation says is that theres a temp diff and moisture in the air. It doesnt say how much, or even that its high enough for fruiting.

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Take a cold beer out of the fridge, oh look condensation!! i better get the dehumidifier going!!!!

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Also, we have seen many people post shouting "theres no condensation in my fruiting chamber! is my humidity low/how to raise humidity"

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feelfunny said:

this is the most fun i have had all night

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  Shit...  I nearly

cne9999 said:

�Relative humidity� compares the actual amount of water vapor in the air with the amount of water vapor that the air can actually hold.  This factor changes with temperature, pressure, other gas content such as nitrogen, etc�

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This is actually what confuses most people. The above statement is incorrect.

Air is not a sponge that 'holds' water. RH is very simply a factor of 2 things: the current vapor pressure of water in the space in question, and the maximum possible vapor pressure of the water at that temperature.

The maximum possible vapor pressure of water at a given temperature is a scientific constant.

So really the only variables at play are the current vapor pressure of water and the current temperature of that water vapor.

It's counter-intuitive, but true.

This is why their arguments are silly. They keep saying in all caps: CONDENSATION IS CAUSED BY A TEMPERATURE DIFFERENTIAL. But RH is all about temperature differentials. Condensation and dewpoint are directly related to RH. That's the point I've been trying to make and that you make very well in your post above.

I do admit that a hygrometer is a useful tool to have. Because as I've admitted several times, the absence of condensation is not an accurate indication of anything at all. RH could be zero, 100, or any point in between.

I'm glad that someone else finds this as amusing/interesting as I do.

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I covered this example in my post. I doubt you even bothered to read it before you regurgitated the crap you've absorbed from reading too many RR posts.

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I can't believe such a simple 5th grade science lesson can be so hard to understand.  If you think condensation is an indicator of HIGH humidity, it's not worth arguing the point.  My beer will get condensation in the summer in the desert, even though ambient humidity is 10% or less.

Condensation indicates there at least was some humidity in the air, because it obviously formed condensation. However, it gives no indication of how much humidity was in the air. That moisture is no longer in suspension, because the surface of the terrarium has reached the dew point.  This happens most often when the lights are turned on, because the greenhouse effect warms the air in the terrarium(reducing RH by the way) to the point where the dew point is reached on the surface, thus forming condensation.  Using a shotgun terrarium generally eliminates this condensation problem by exchanging air across the temperature differential, thus canceling the temp swing.  It's the entire basis of how the shotgun terrarium works.

The presence of condensation is not an indicator of high humidity within the terrarium.  I still fail to see how this crap you've absorbed from reading too many RR posts is such a hard subject to grasp. This isn't advanced science.
RR

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the real motive for disagreement is not that you are wrong, its just that you said it, and others use it as reference.

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