When the dial is set at 1 liter, 24 percent oxygen is being delivered. For each increase in the number on the flow meter dial, the amount of oxygen delivered increases by 4 percent. If the flow meter is set at 2 liters, the oxygen delivered goes up to 28 percent.
From stem to stern, Infinity has a length of 5,694.2 meters (18,681.6 feet), a beam of 833.3 meters (2,733.9 feet), and a height of 1,041.2 meters (3,415.9 feet). This makes her the largest warship the UNSC Navy has ever commissioned.
This page has an interactive tool that helps us to internalize how small infinitesimal things are, and how big infinity might be. There is also an embedded copy of the famous Eames Power of Ten film, and a video by Neil deGrasse Tyson. See more here. This hi-res photo from the rings of Saturn shows the Earth in frame, to scale.