Being that St. Patrick’s Day is right around the corner, Americans across the country (with or without an Irish background) are gearing up to hit the town dressed in green and drink their favorite beer. Whether it be an IPA, lager, or pilsner, microbreweries everywhere adhere to a very specific process when it comes to making some of America’s most popular brews. A video uploaded by Reactions explains the chemistry behind craft beer just in time for St. Patty’s.

“It’s been around for centuries, but it seems like beer has never been more popular,” Reactions explained in a statement. “Microbreweries are cranking out special stouts, IPAs, lagers and pilsners. And the flavors and aromas of each of those brews all come down to chemistry. This week, in honor of St. Patrick’s Day, Reactions takes on craft beer chemistry.”

While the majority of Americans will undoubtedly throw back at least one bottle of suds during this year’s St. Patrick’s Day, partying on March 17 pales in comparison to four other American holidays. According to BACtrack Breathalyzers Consumption Report 2013, Americans record the highest average BAC on New Year’s Eve (0.095 percent), Super Bowl Sunday (0.087 percent), Valentine’s Day (0.081 percent), and the Fourth of July (0.079 percent). The average BAC for U.S. drinkers on St Patrick’s Day in 2013 was 0.057 percent.