What is a propion?

Does tincture go bad? Where can I find all of the Cooking Network recipes that I see on television, online? How many calories in a large bag of chips? Do zero calorie food have calories when you eat more then one serving? How many calories fat and protein are in a slice of pizza? What are the different types of beer and how are they different? Why vinegar is used in noodles? Which colors become difficult to distinguish when you consume alcohol? How do you make chilis presidente margaritas? Why is it important for cooks to learn to calculate recipe costs without the aid of a computer? 5 tablespoons equals how many ml? What food has trans fat? What size is a number 1 can in a recipe? Why lime wash a chicken? What is an alcohol intoxication? Is ciclopirox cream still good a year after expiration date? What does fiaidd mean? What did the gallon milk jug look like in America before the plastic jug came along? What are some healthy Risotto recipes? What is the difference between a buffer and an indicator?

What is a propion?