Archive for the ‘Measurement’ Category

Near Beer: Why?

Friday, January 16th, 2009

The first question any loyal beer fan should ask when affronted with the existence of non-alcoholic beer is “Why?” Sure, the I enjoy beer for the flavor, not the effect argument can be made, but it doesn’t hold much water considering that average non-alcoholic beer is just this side of undrinkable. Beer — the true staff of life, the impetus for civilization — is supposed to be intoxicating. What could possibly be good reasons for drinking NA beers? Moreover, if you had to drink non-alcoholic brews, which ones are “good?” Doesn’t it still have some alcohol in it? What qualifies as non-alcoholic? How much would you have to drink to get drunk? How do they even make that stuff? Because we at SYD love you all very much, we will do the dirty work of answering all of these burning questions.

First and foremost: Why the heck would you want to drink NA Beer? — No seriously, who drinks this stuff?

For starters, the kind of ladies like the one you see in the above image. Some pregnant women actually like beer, and have a hard time giving it up for nine months. While research has shown that a real beer or two per day will not adversely affect your child in the form of Fetal Alcohol Syndrome, and is actually healthy for the mother, it can be difficult for some to socialize with the rest of us as we swill down real beer after delicious real beer, while they cannot. Near beer can make that situation a little less harsh in the jealousy department. Plus, if they drink it out of a glass with the bottle out of sight, they’re likely to completely appall onlookers who don’t realize it’s NA — which is kind of awesome. (more…)

How do I do that? Calculating ABV

Saturday, December 13th, 2008

I just kegged a smoked porter I brewed last week and let ferment for about seven days. Let’s say I wanted to know what the approximate alcohol by volume of this beer is. How do I figure that out? Time to remember your sophomore chemistry.

Equipment needed:

  • A brewer’s hydrometer
  • A brewer’s thermometer of some type (instant read electronics are plenty accurate.)
  • Pad and pencil

NOTE: I use a hydrometer, but there are other methods. A refractometer is also a very accurate measurement tool. I just don’t have one, so I wouldn’t call myself experienced enough with their operation to comfortably explain it here. However, Christmas is coming and here’s a nice link to the Thirsty Brewer where any of you nice readers could purchase one for our mutual edification.

We’re going to measure the specific gravity, or liquid density of the wort.

First thing’s first: You’ve brewed your beer, turned off the burner and begun cooling your wort. When the wort is approximately 60˚ Fahrenheit, collect a sample of your cooled wort in the vessel that accompanies your hydrometer. Fill the cylinder enough to allow the hydrometer to float, but also leave enough room to allow for displacement so there’s no spillover.

You’ll notice that there are graduated numbers on the narrower end of the hydrometer. The higher number at the bottom of the narrow end usually reads 1.170, while the topmost number is .990.

When you drop the hydrometer into your sample, it should float with a certain portion of the graduated narrow end submerged, and a portion revealed.

Just like chemistry class, you’ll want to read the number that is closest to the middle valley of the meniscus, where the liquid ends, and the headspace begins.

This specific gravity reading — 1.047 in the case of my smoked porter — is referred to as the original gravity, or O.G. Ice-T would be proud. Write this number down. I often write the O.G. down on the side of the fermenter with a Sharpie. (more…)