Azeo is 97.2%ABV
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Azeo is 97.2%ABV
Recently, JacksonBrown showed me that azeo is 95.6%ABW (alcohol by weight), not %ABV (alcohol by volume). This was a total surprise. How many times have we seen pictures of alcoholometers proudly showing 95.6% sitting in a parrot? But alcoholmeters measure in %ABV.
It would make sense that the azeotrope would be given in ABW, as it is insensitive to temperature.
Converting from ABW to ABV gives 97.2%ABV at either 60*F or 20*C (the difference is only 0.003%).
M
It would make sense that the azeotrope would be given in ABW, as it is insensitive to temperature.
Converting from ABW to ABV gives 97.2%ABV at either 60*F or 20*C (the difference is only 0.003%).
M
Re: Azeo is 97.2%ABV
That's why my meter always said 97 when making my neutral.
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- still_stirrin
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Re: Azeo is 97.2%ABV
Not only that but the volumee of the sum is less that the sum of the volumes.
Ethanol-water mixtures have less volume than the sum of their individual components at the given fractions. Mixing equal volumes of ethanol and water results in only 1.92 volumes of mixture. Mixing ethanol and water is exothermic, with up to 777 J/mol being released at 298 K.
ss
Ethanol-water mixtures have less volume than the sum of their individual components at the given fractions. Mixing equal volumes of ethanol and water results in only 1.92 volumes of mixture. Mixing ethanol and water is exothermic, with up to 777 J/mol being released at 298 K.
ss
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- thecroweater
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Re: Azeo is 97.2%ABV
OK I'm wondering how to calculate ABW to ABV (at 20'c), a quick look at some beer sites will say abw x 1.25 = abv , (.8 back the other way) I just can't see how that can be right. If 0 abw = 0 abv and 100% abw = 100% abv then I read 3%abw is 4% abv and azeotropic alcohol is 95.63% ABW which equates to 97.2 ABV @ 20'c then a constant and linear fomular is useless. OK so a read that ethanol has a density of .789 ei 1 ltr = .789 kgs , for the non metrics water is 1 liter = 1 kg .
Ok so what I haven't grasped is to calculate properly abw to abv, I get that it won't be linear due to the differential weights of water and ethanol and at every % change so does the ratio.
Ok so what I haven't grasped is to calculate properly abw to abv, I get that it won't be linear due to the differential weights of water and ethanol and at every % change so does the ratio.
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Re: Azeo is 97.2%ABV
i put this in the other thread, but it may as well go here too, as it answers the question posed by thecroweater
http://www.cra-arc.gc.ca/tx/tchncl/lchl ... u-eng.html" onclick="window.open(this.href);return false;" rel="nofollow
http://www.cra-arc.gc.ca/tx/tchncl/lchl ... u-eng.html" onclick="window.open(this.href);return false;" rel="nofollow
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Re: Azeo is 97.2%ABV
It is my understanding that the relationship is not linear because when you mix a given volume of 100% liquid water and another given volume of 100% liquid ethanol, the resultant volume is less than the total of the two separate volumes. It has something to do with ethanol and water molecules being able to sit closer to each other than themselves in liquid form.thecroweater wrote:OK I'm wondering how to calculate ABW to ABV (at 20'c), a quick look at some beer sites will say abw x 1.25 = abv , (.8 back the other way) I just can't see how that can be right. If 0 abw = 0 abv and 100% abw = 100% abv then I read 3%abw is 4% abv and azeotropic alcohol is 95.63% ABW which equates to 97.2 ABV @ 20'c then a constant and linear fomular is useless. OK so a read that ethanol has a density of .789 ei 1 ltr = .789 kgs , for the non metrics water is 1 liter = 1 kg .
Ok so what I haven't grasped is to calculate properly abw to abv, I get that it won't be linear due to the differential weights of water and ethanol and at every % change so does the ratio.
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Re: Azeo is 97.2%ABV
OK yes that is for certain a fact but not one I had taken into account. Fuckit that's prolly one to many variables for me to calculate a formula. To me now the controlling factors are varying ratios of different masses along with a varying volume related to those varying masses oh boy that is some tricky maths
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Re: Azeo is 97.2%ABV
Hi Crow,
Here is a formula:
%ABW = 0.9538839570686711 + 0.6799353140478662 * x +
0.0029456109658481753 * x^2
where X is %ABV at 20 degrees C.
It is accurate to +/- 0.5% except at very low %ABW (0 to 5%) and very high (around azeo) where it is off by 1%. You can see this because when X = 0, the result is 0.95%. I can generate more accurate equations if desired.
M
Here is a formula:
%ABW = 0.9538839570686711 + 0.6799353140478662 * x +
0.0029456109658481753 * x^2
where X is %ABV at 20 degrees C.
It is accurate to +/- 0.5% except at very low %ABW (0 to 5%) and very high (around azeo) where it is off by 1%. You can see this because when X = 0, the result is 0.95%. I can generate more accurate equations if desired.
M
Re: Azeo is 97.2%ABV
Here is a much better formula:
%ABW = 0.8225461635345204 *x - 0.0007912419651469305 * x^2+
0.000025170469315263712 x^3
where x = %ABV
Maximum error is 0.3% at x=90
%ABW = 0.8225461635345204 *x - 0.0007912419651469305 * x^2+
0.000025170469315263712 x^3
where x = %ABV
Maximum error is 0.3% at x=90
- thecroweater
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Re: Azeo is 97.2%ABV
cheers for that, I'm still reading up on a lot of this as this subject seems to be a major misconception. Not that it really matters for most ppl but I like to have me facts straight.
Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety. Benjamin Franklin