Many NOx sensors work by first removing oxygen and then breaking down the nitrogen oxides to provide a reading. However, the NexTech sensor eliminates the need to remove oxygen; the sensor material is engineered to have a strong NOx sensitivity even in the presence of oxygen.
Sour beers are probably the oldest style of brew in the world, but they're just starting to get popular in the States. They were all the buzz at this year's Great American Beer Festival. And with hundreds of brewers now dabbling in sours, it's easier than ever to find them at a local bar or grocery store.
Vinegar is a sour liquid that is used to flavor and preserve food. It is made by putting alcohol through a chemical change called fermentation. Sour wine is the meaning of the word vinegar, for, as a commercial product, vinegar was probably first made from wine. Vinegar is a sour liquid produced by acetic-acid fermentation of any of the numerous dilute alcoholic liquids.