Which type of beer is typically served without additional gas?

Cask beer is typically served without additional gas, relying on the natural carbonation produced during the fermentation process. Casks are sealed containers that allow for secondary fermentation, which generates carbon dioxide, creating a naturally carbonated product. When served, cask beer is often hand-pumped or gravity poured, providing a less carbonated and smoother experience compared to other types of beer that utilize gas systems.

Keg beer and draft beer usually involve additional gas, such as carbon dioxide or nitrogen, to push the beer out of the container, resulting in a more highly carbonated beverage. Bottle-conditioned beer, while it may also undergo natural carbonation, is often served with the residual yeast and can be influenced by gas additions, depending on the bottling process.