Roofing Square Explained. The term roofing square and roof pitch are the most commonly used terms in the roofing industry. 1 roofing square = 100 square feet. It does not matter how you arrive at 100 square feet. 10 feet x 10 feet = 100 square feet or 1 roofing square. 5 feet x 20 feet = 100 square feet or 1 roofing square.
How much does it cost to produce 1 gallon of ethanol?It will cost about $1.10 to $1.20/gal to make the alcohol from various feed-stocks like corn, barley, potatoes, or Jerusalem artichokes. You will also have by-products which you can sell or use as animal feed, reducing the total cost down to about $.95/gal.. If you do this on a large enough scale, it will cost anywhere form $0.95/gallon to $1.40/gal to make the alcohol, depending on your feedstock. Look at my web pages, Mashing and Fermentation and also,  Molasses and Rum .
Check out Beer Making 101 to get started. The alcohol content of beer is calculated in abv, or alcohol by volume. The percentage of alcohol by volume represents the amount of ethanol present within 100 milliliters of the beverage. Most beers contain between 5% to 14% alcohol by volume, give or take. The actual alcohol comes from the fermentation process, where cereal grains like barley, or another starch source, are steeped in water, and a brewerâs yeast is added to trigger the fermentation process.