Alcohol has a lower boiling point than water, so it evaporates faster when heated. However, this does not mean that all the alcohol bakes off completely in the oven. Some amount of alcohol remains in the final product, depending on the type, amount, and cooking time of the alcohol. According to a study by the U.S. Department of Agriculture, only 5% of alcohol remains after baking for 2.5 hours, while 40% remains after baking for 15 minutes. If you want to avoid alcohol in your baking, you can use non-alcoholic substitutes such as juice, broth, or water.