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OfflineMych
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what RH to measure dry weight?
    #4295995 - 06/14/05 07:48 PM (12 years, 4 months ago)

So i harvested my first 60 wet grams.. so i was thinking "oh cool, thatll dry to 3 2g doses"  so then i dried my shrooms and they are sitting at 20% RH and they weigh 4g :frown: wtf? where did the other 2g go??

what is the typical RH you should have when weighing mushies for dosing?


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Offlinedrugsaregood
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Re: what RH to measure dry weight? [Re: Mych]
    #4296023 - 06/14/05 07:54 PM (12 years, 4 months ago)

relative humidity is the humidity in the air. So how much air is in your mushrooms? Multiply that amount of air by say 20% and that's how much water weight is added to the shroom due to air humidity. I'm sure that's not exactly right, but whatever. Maybe your estimation of the dry weight of 60 wet grams was a little off. 10% dry weight isn't always true so unless you lost some shrooms, your 2g that's missing probably evaporated with the rest of the water.


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InvisibleArrakis
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Re: what RH to measure dry weight? [Re: Mych]
    #4296039 - 06/14/05 07:56 PM (12 years, 4 months ago)

Yeah, the wet weight "divide by 10 for dry weight" formula isn't always very accurate, especially when dealing with low weights. It just gives you an estimate.

Just let it be a lesson: "Don't count your shrooms before they dry"


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Offlinescatmanrav
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Re: what RH to measure dry weight? [Re: drugsaregood]
    #4296040 - 06/14/05 07:56 PM (12 years, 4 months ago)

>where did the other 2g go?

It was water and evaporated. Welcome to the lesson of shrooms arent exactly 10% dry mass...more like 8 usually, sometimes more, sometimes less.


--------------------
"life is like a drop of rain getting closer and closer to falling into a lake, and then when you hit the lake there is no more rain drop, only the lake."

Growing with bags, start to finish (including my new grain and substrate prep)
Anyone looking to start bulk tubs/mono tubs/shotgun hybrids? Good tubs to use..
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Turn your closet into a fruiting chamber
Casing layer colonization and overlay


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OfflineMych
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Re: what RH to measure dry weight? [Re: scatmanrav]
    #4296065 - 06/14/05 07:59 PM (12 years, 4 months ago)

Quote:

scatmanrav said:
>where did the other 2g go?

It was water and evaporated. Welcome to the lesson of shrooms arent exactly 10% dry mass...more like 8 usually, sometimes more, sometimes less.



yes i fully understand this, it was more of a rhetorical question due to my dissapointment. but the question i have is : what RH do you typically weigh mushrooms at for their "dry weight" ?


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Offlinedrugsaregood
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Re: what RH to measure dry weight? [Re: Mych]
    #4296078 - 06/14/05 08:02 PM (12 years, 4 months ago)

read my post... the amount of air (in grams) in your shrooms times the RH is how much water is added to your dose. So how much air do you think is in there?


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OfflineMych
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Re: what RH to measure dry weight? [Re: drugsaregood]
    #4296086 - 06/14/05 08:04 PM (12 years, 4 months ago)

Quote:

drugsaregood said:
read my post... the amount of air (in grams) in your shrooms times the RH is how much water is added to your dose. So how much air do you think is in there?



yea let me just go put my shrooms in a dunk tank so i can measure their volume.. oh wait

and your statement makes the assumption that 1 cubic inch of water = 1 cubic inch of air at 100% RH..


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Offlinedrugsaregood
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Re: what RH to measure dry weight? [Re: drugsaregood]
    #4296089 - 06/14/05 08:04 PM (12 years, 4 months ago)

it's also gonna depend on what elevation you're at as atmospheric pressure can greatly effect the solubility of air and water.


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Offlinedrugsaregood
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Re: what RH to measure dry weight? [Re: Mych]
    #4296102 - 06/14/05 08:08 PM (12 years, 4 months ago)

Quote:

Mych said:

and your statement makes the assumption that 1 cubic inch of water = 1 cubic inch of air at 100% RH..




no actually it doesn't, solubilities are typically measured by mass (or atoms or molecules) not volume.


--------------------
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OfflineMych
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Re: what RH to measure dry weight? [Re: drugsaregood]
    #4296114 - 06/14/05 08:11 PM (12 years, 4 months ago)

Quote:

drugsaregood said:
Quote:

Mych said:

and your statement makes the assumption that 1 cubic inch of water = 1 cubic inch of air at 100% RH..




no actually it doesn't, solubilities are typically measured by mass (or atoms or molecules) not volume.




Hi, what RH are your shrooms at when you weigh them for their dry weight?


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Offlinedrugsaregood
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Re: what RH to measure dry weight? [Re: Mych]
    #4296134 - 06/14/05 08:16 PM (12 years, 4 months ago)

the point is it doesn't fucking matter. whether at a low RH like 10% or a high RH like 80+%, there is so little water added to the mass of the dose. Even if you had .5g air in your shrooms, which is actually several liters worth, the amount of water present would be on the order of 10% of the mushroom mass. So that's your error, 10%, your 2g dose of shrooms could be 2.2g with lots of water or 1.8g totally dry.


--------------------
For "incoherent dribble" (drivel) try www.dictionary.com

Everybody seems to think I'm lazy
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Running everywhere at such a speed
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InvisibleRoadkillM
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Re: what RH to measure dry weight? [Re: Arrakis]
    #4296159 - 06/14/05 08:19 PM (12 years, 4 months ago)

Quote:

Arrakis said:

Just let it be a lesson: "Don't count your shrooms before they dry"




very true!~

:smile:


--------------------
Laterz, Road

Who the hell you callin crazy?
You wouldn't know what crazy was if Charles Manson was eating froot loops on your front porch!


Brainiac said:
PM the names with on there names, that means they have mushrooms for sale.



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OfflineMych
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Re: what RH to measure dry weight? [Re: drugsaregood]
    #4296171 - 06/14/05 08:22 PM (12 years, 4 months ago)

Quote:

drugsaregood said:
the point is it doesn't fucking matter.  whether at a low RH like 10% or a high RH like 80+%, there is so little water added to the mass of the dose.  Even if you had .5g air in your shrooms, which is actually several liters worth, the amount of water present would be on the order of 10% of the mushroom mass.  So that's your error, 10%, your 2g dose of shrooms could be 2.2g with lots of water or 1.8g totally dry.




you forgot to mention temperature variance too :wink:

if the water weight variance between 20% RH and say.. 60% RH is very mintue, then cool. i can accept that


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Offlinedrugsaregood
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Re: what RH to measure dry weight? [Re: Mych]
    #4296178 - 06/14/05 08:25 PM (12 years, 4 months ago)

temperature and pressure are up to you... ask your high school chemistry or math teacher, they are super easy calculations.


--------------------
For "incoherent dribble" (drivel) try www.dictionary.com

Everybody seems to think I'm lazy
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Running everywhere at such a speed
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InvisibleRoadkillM
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Re: what RH to measure dry weight? [Re: drugsaregood]
    #4296192 - 06/14/05 08:28 PM (12 years, 4 months ago)

Quote:

drugsaregood said:

ask your high school chemistry or math teacher, they are super easy calculations.




I think they might be dead now!~

I've been out of school...28 years now!~

lolzz

:smirk:


--------------------
Laterz, Road

Who the hell you callin crazy?
You wouldn't know what crazy was if Charles Manson was eating froot loops on your front porch!


Brainiac said:
PM the names with on there names, that means they have mushrooms for sale.



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Offlinedrugsaregood
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Re: what RH to measure dry weight? [Re: Roadkill]
    #4296202 - 06/14/05 08:32 PM (12 years, 4 months ago)

I smoked and had a chance to clear my head of work stuff and realized that if your shrooms are stored properly, they should be well below even 10-20% RH. Even more emphasis on, "it doesn't fucking matter" with that little water around.


--------------------
For "incoherent dribble" (drivel) try www.dictionary.com

Everybody seems to think I'm lazy
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Running everywhere at such a speed
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