Pur nitrogen (N2) is the industry standard used by all major coffee shops, cafés and restaurants. Nitroknox N2 is colorless, odorless, tasteless gas that is the most plentiful element in Earth's atmosphere. When infused with drinks, it gives a rich, creamy head, and smooth finish. This is a direct effect of the nitrogen bubbles being smaller in size than those of carbon dioxide, resulting in a delicious beverage with a thicker mouthfeel.