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InvisibleZippoZM
Knomadic
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Registered: 06/17/03
Posts: 13,227
Loc: Pongyang, North Korea
why does humidity go down as temp rises?
    #1793447 - 08/08/03 08:50 PM (14 years, 2 months ago)

i use a pf style fruiting chamber to clone wildflowers. i have noticed that when the lights on the terrarium go on the temperature goes up the rh has a tendancy to go down.
why is this?
for example a 7 degree rise resulted in the loss of 5% rh

whats the deal?


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PEACE

:mushroom2:zippoz:mushroom2:



"in times of widespread chaos and confusion, it has been the duty of more advanced human beings - artists, scientists, clowns, and philosophers - to create order. In such times as ours however, when there is too much order, too much m management, too much programming and control, it becomes the duty of superior men and women and women to fling their favorite monkey wrenches into the machinery. To relieve the repression of the human spirit, they must sow doubt and disruption"

"People do it every day, they talk to themselves ... they see themselves as they'd like to be, they don't have the courage you have, to just run with it."


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Offlineshirley knott
not my real name
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Registered: 11/11/02
Posts: 9,105
Loc: London Flag
Last seen: 9 months, 15 days
Trusted Cultivator
Re: why does humidity go down as temp rises? [Re: ZippoZ]
    #1793462 - 08/08/03 08:53 PM (14 years, 2 months ago)

basic physics.


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buh


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Offlinecdchriscd
Green Acres

Registered: 04/25/03
Posts: 716
Loc: FL
Last seen: 14 years, 1 month
Re: why does humidity go down as temp rises? [Re: ZippoZ]
    #1793465 - 08/08/03 08:54 PM (14 years, 2 months ago)

I'd imagine the heat from the light dries the environment a bit.



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Offlinefloridaboi101
Fiddlestix

Registered: 07/31/03
Posts: 282
Loc: SW Florida
Last seen: 6 years, 7 months
Re: why does humidity go down as temp rises? [Re: ZippoZ]
    #1793467 - 08/08/03 08:54 PM (14 years, 2 months ago)

sounds like its dry to me...dry heat=evaporation


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Got weed?


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InvisibleZippoZM
Knomadic
 User Gallery

Registered: 06/17/03
Posts: 13,227
Loc: Pongyang, North Korea
Re: why does humidity go down as temp rises? [Re: floridaboi101]
    #1793483 - 08/08/03 08:58 PM (14 years, 2 months ago)

cool, so nothing to wory about then. thanks for the quick responses. any other ideas?


--------------------
PEACE

:mushroom2:zippoz:mushroom2:



"in times of widespread chaos and confusion, it has been the duty of more advanced human beings - artists, scientists, clowns, and philosophers - to create order. In such times as ours however, when there is too much order, too much m management, too much programming and control, it becomes the duty of superior men and women and women to fling their favorite monkey wrenches into the machinery. To relieve the repression of the human spirit, they must sow doubt and disruption"

"People do it every day, they talk to themselves ... they see themselves as they'd like to be, they don't have the courage you have, to just run with it."


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Offlineshirley knott
not my real name
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Registered: 11/11/02
Posts: 9,105
Loc: London Flag
Last seen: 9 months, 15 days
Trusted Cultivator
Re: why does humidity go down as temp rises? [Re: ZippoZ]
    #1793485 - 08/08/03 08:59 PM (14 years, 2 months ago)

get anno in here. he knows all that stuff and is good at finding teaching metaphors to explain it....


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buh


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Offlinefloridaboi101
Fiddlestix

Registered: 07/31/03
Posts: 282
Loc: SW Florida
Last seen: 6 years, 7 months
Re: why does humidity go down as temp rises? [Re: ZippoZ]
    #1793487 - 08/08/03 08:59 PM (14 years, 2 months ago)

well how are you humidifying it?


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Got weed?


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Invisibledog
straw dog

Registered: 06/20/02
Posts: 2,790
Loc: Route 66
Re: why does humidity go down as temp rises? [Re: ZippoZ]
    #1793510 - 08/08/03 09:05 PM (14 years, 2 months ago)

Read this thread, paying attention to the post by jong21. It answers your question.


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Fascism (fash'izem) n. A governmental system marked by a centralized dictatorship, stringent socioeconomic controls, and often belligerent nationalism. see also: the Bush Administration.


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Invisibledeanofmean
mycophagous

Registered: 12/07/02
Posts: 2,017
Loc: PNW
Re: why does humidity go down as temp rises? [Re: dog]
    #1793705 - 08/08/03 10:04 PM (14 years, 2 months ago)

to put it simply .
air expands at higher temps . so more h2o is needed to raise rH .


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InvisibleLiL_KuSsH
Lost In The Trip

Registered: 05/07/03
Posts: 3,001
Deleted [Re: deanofmean]
    #1793711 - 08/08/03 10:06 PM (14 years, 2 months ago)

Post deleted by administrator


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InvisibleBrainFarmer
Farmicist

Registered: 03/06/03
Posts: 544
Loc: lounging betwixt lobes...
Re: why does humidity go down as temp rises? [Re: ZippoZ]
    #1794131 - 08/09/03 12:48 AM (14 years, 2 months ago)

Quote:

use a pf style fruiting chamber to clone wildflowers. i have noticed that when the lights on the terrarium go on the temperature goes up the rh has a tendancy to go down.
why is this?
for example a 7 degree rise resulted in the loss of 5% rh






rh = relative humidity. ie the moisture content of the air as a percentage of the maximum possible (full saturation). the amount of moisture the air can hold increases with temperature, thus the RH falls, even though the absolute humidity stays the same.


--------------------
Gate Gate Paragate Parasamgate Bodhisvah

Formula: 0


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InvisibleShamanorrhea
Stranger
Registered: 06/20/03
Posts: 304
Re: why does humidity go down as temp rises? [Re: BrainFarmer]
    #1794262 - 08/09/03 01:43 AM (14 years, 2 months ago)

If you aren't already using one, try a simple, low-wattage flourescent light. These lights are "cool", as in they give off little to no heat, and are relatively inexpensive.

When it comes to lighting I follow a very simple rule of thumb, if you can see them then there is enough light.


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OfflinePsilocybin_monkey
Shroomer

Registered: 06/19/03
Posts: 1,340
Loc: Dragon's Den
Last seen: 6 years, 9 days
Re: why does humidity go down as temp rises? [Re: deanofmean]
    #1794276 - 08/09/03 01:50 AM (14 years, 2 months ago)

Quote:

deanofmean said:
to put it simply .
air expands at higher temps . so more h2o is needed to raise rH . 




thats pretty cool thx for the info I never knew that :smile: 


--------------------
Welcome to my world!



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Invisibledeanofmean
mycophagous

Registered: 12/07/02
Posts: 2,017
Loc: PNW
Re: why does humidity go down as temp rises? [Re: Psilocybin_monkey]
    #1794335 - 08/09/03 02:17 AM (14 years, 2 months ago)

like shirley said, "basic physics " :smirk: 


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InvisibleTxTec
Texas home andheart breaker...

Registered: 12/19/02
Posts: 1,328
Re: why does humidity go down as temp rises? [Re: deanofmean]
    #1794356 - 08/09/03 02:31 AM (14 years, 2 months ago)

Quote:

deanofmean said:
like shirley said, "basic physics " :smirk: 


If you pour a glass of water on the sidewalk when its 100 degrees outside it does what? it evaporates....RH is a measurement in how many grains of moisture is in a given amount of atmosphere ...You need a psychrometer to measure humidity which is a difference between the wet buld and dry bulb temp...thats why Mr. Carrier invented the Psych chart....


--------------------
I felt a warm warm breeze that melted metal and steele


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Invisibledeanofmean
mycophagous

Registered: 12/07/02
Posts: 2,017
Loc: PNW
Re: why does humidity go down as temp rises? [Re: TxTec]
    #1794551 - 08/09/03 04:30 AM (14 years, 2 months ago)

if you are in Arizona, and the temp is 120F and rH is 20%, what are the chances of your piss hitting the sidewalk ?


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Invisibledeanofmean
mycophagous

Registered: 12/07/02
Posts: 2,017
Loc: PNW
Re: why does humidity go down as temp rises? [Re: deanofmean]
    #1794565 - 08/09/03 04:36 AM (14 years, 2 months ago)

answer: it depends on how tall you are . :laugh: 


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InvisibleDanKnugget
Mysterious Traveller
Male

Registered: 07/15/03
Posts: 1,074
Loc: On a boat
Re: why does humidity go down as temp rises? [Re: deanofmean]
    #1794580 - 08/09/03 04:43 AM (14 years, 2 months ago)

rofl


--------------------
My 3 proverbs:
1. School is for people who don't know stuff.
2. Jobs are for losers.
3. Reading is for people with nothing better to do.


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Invisibledeanofmean
mycophagous

Registered: 12/07/02
Posts: 2,017
Loc: PNW
Re: why does humidity go down as temp rises? [Re: DanKnugget]
    #1794615 - 08/09/03 05:10 AM (14 years, 2 months ago)

glad i made someone laugh  :smile:


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InvisibleTxTec
Texas home andheart breaker...

Registered: 12/19/02
Posts: 1,328
Re: why does humidity go down as temp rises? [Re: deanofmean]
    #1794652 - 08/09/03 05:45 AM (14 years, 2 months ago)

Yep 5 shrooms worth...ck ya ratings :smile:


--------------------
I felt a warm warm breeze that melted metal and steele


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