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Take 12 gallons 120 proof cut with 3 gallons water ya end up with what proof?

Ok , I will guess 90 proof . My reasoning is you are cutting total mix by 25% so wouldnt that reduce proof by 25% also?

Lol if i knew id not asked but i was thinking cut by 1/5

Why one fifth? . That would mean (if I follow your thinking) that you are basing your calcs on 15 gallons. Wouldnt your calcs be based on the 12 gallons , that is what you are modifying.

Hey guys, here is a little equation that will help you to figure out how much you need for dilution

C1V1=C2V2
So reworking the equation you get C1V1/V2 substituting numbers you get
(12)(120)/15=C2
96proof.

Furball

thanks

yep, 7.2 gallons pure ethonol in 15galons total =7.2/15=48%=96proof.

aproximately,
0.5 l ethanol and 0.5 l water is not exact 1l (of 50%)

Stoker, you are correct, but the error is quite small.

96 proof. You can back into it here.

http://distillers.tastylime.net/library ... index.html" onclick="window.open(this.href);return false;" rel="nofollow

distilling, diluting the distillate

Yep saw that but I figure in gallons

tater wrote:Take 12 gallons 120 proof cut with 3 gallons water ya end up with what proof?

Tater, Did you get your answer?? I changed your gallons into liters, and here is what it is. If you dulute 45.42L (12gal) of 60%abv with 11.355L (3gal) of water you will have 48%abv. Hope that helps. Just in case you do not have this site, here is a good way to convert gal. into liters, and all kinds of other conversions, go to http://www.convert-me.com onclick="window.open(this.href);return false;" rel="nofollow

It does not matter that the screen says liters, just think of it in units. Screen says liters and I have 5 gallons, I put in 5. Although the answer says liters, I use that amount of gallons. The computer never knows the differance.

stoker wrote: 0.5 l ethanol and 0.5 l water is not exact 1l (of 50%)

Do you know why?

If I remember well, it is a question of inter molecular space...
Everyone knows this Pierre-Gilles de Gennes (Physica Nobel price, frenchman) demonstration: put 1 liter of little stones in a pot and add 1 liter sand... The result wouldn't reach 2 liters, because sand takes place in the spaces between the stones.

tater wrote:Take 12 gallons 120 proof cut with 3 gallons water ya end up with what proof?

So Tater, Was my answer right that I had posted in regards to this question?? Let me know. Thanks.

Sure was there WB thanks

3.785 liters to a gallon. 12 X 3.785 = 45.42 L. 3 X 3.785 = 11.355 L

Proof is twice the percentage of alcohol, so 120proof = 60%abv

now: 2 X ((60/48 )-1) = 11.355 (did this by trial and error useing the calculator on tonys site... entered 45, then 47, then 48 which gave me the desired result)

so your final answer is 48% X 2 = 96 proof

'cept here where 100 proof is 57.1% ABV, and mainland Europe who use the Gay-Lussac proof system.
40% ABV - the old standard spirit strength ( now usualy 37.5% for excise reasons ) is 40 proof (Gay-Lussac), 80 proof (American), or 70 proof (British)

You'd be hard pushed to find a bottle in the uk that is marked in proof - ABV is generaly the only measurement on the bottle as it avoids so much confusion.

How did the US proof system come about? Seems strange to measure the ABV and double it rather than just use the ABV.

I have the same question.
why would someone want a scale on /200??

Watershed wrote:How did the US proof system come about? Seems strange to measure the ABV and double it rather than just use the ABV.

stoker wrote:I have the same question.
why would someone want a scale on /200??

http://homedistiller.org/forum/viewtopi ... der+proved

This post is the only reason I've ever heard of, can't say if its ture.

The gunpower system is the origin of the UK proof - gunpowder wetted with a mixture of half rain water and half spirit at room temp should still ignite if the spirit is proof ( 57.1% ). Later the test was changed so the legal definition stated that proof spirit weighed 7 pounds, 12 ounces per gallon, at 51° Fahrenheit (sg of 0.923).

By chucking in molasses and sugar importers got round some of the duty on imported spirit by upping the SG thereby lowering the apparent proof.

There is also a unit calc. On home distiller Look under theory.