hydrometer question

chris2286

so you subtract the FG from OG and multiply by 131.25 and that equals to % ABV

my question is whats the 131.25 about? what does it stand for? whats its meaning?

It may b a silly question but its really bugging me thanks in advance

Baz_

www.homebrewmart.com/alcohol.html a little more detail at that address.

Multiply the difference by 105 to get alcohol by weight and the abw result by 1.25 to get alcohol by volume.

Skip one step by multiplying the difference by (105*1.25=131.25).

Don't know where the numbers come from but you might be able to do a more thorough web search to find out .

evolving_doors

Suppose it's like saying "If i multiply the diameter by PI i get the circumference, so what does PI stand for"

Presume it's just a ratio!

Baz_

Since there's already a hydrometer question thread I'll just throw my hydrometer question in here. Does everyone sterilise/sanitise their hydrometer?

It says on most instructions that you should but the trial jar and hydrometer never come into direct contact with the beer as it brews because you extract any samples from the fermentor that you run tests on and the hygiene of the hydrometer should have no bearing on the quality of your beer (I think?).

kellso81

Only need to sterilise if you're putting the sample back into the fermenter. I tend not to, I generally drink my samples so no need to sterilise the hydrometer

sharingan

Baz_ wrote: »

Since there's already a hydrometer question thread I'll just throw my hydrometer question in here. Does everyone sterilise/sanitise their hydrometer?

It says on most instructions that you should but the trial jar and hydrometer never come into direct contact with the beer as it brews because you extract any samples from the fermentor that you run tests on and the hygiene of the hydrometer should have no bearing on the quality of your beer (I think?).

On brewing day, my hydrometer is floating in a bucket of sanitiser, along with the other tools that come into contact with the wort.

I usually drop the hydrometer into the wort itself, rather than extracting samples (not all my fermenters have taps).

When not in use, my hydrometer is stored in the clear case it came in, immersed in sterilising fluid.

I never add the sample back in, so the trial jar is not important.

chris2286

Baz_ wrote: »

Since there's already a hydrometer question thread I'll just throw my hydrometer question in here. Does everyone sterilise/sanitise their hydrometer?

It says on most instructions that you should but the trial jar and hydrometer never come into direct contact with the beer as it brews because you extract any samples from the fermentor that you run tests on and the hygiene of the hydrometer should have no bearing on the quality of your beer (I think?).

well i always sanitise my gear before brewing and after sampling, it only takes a few minutes but when it comes to beer im not sure iv only been doin wine and cider as i dont need a cooling belt to make them anyway but i did read up something simular to what your saying but how do ya take a reading test then?

Baz_

the fermentor I have has a tap, i just fill the trial jar from the tap and then pop the hydrometer into the trial jar. No risk of contamination.