Oxygen

thingiverse

People rely heavily on oxygen to breathe; oxygen gas, a vital substance made up of two oxygen atoms bonded together, is normally invisible odorless and tasteless yet never catches fire or sparks easily and takes up approximately one fifth of all air we inhale and exhale; it is also the most abundant substance found on Earth's surface making up about twenty-one percent of everything that surrounds us every single day O the atomic number 8 is also very well known.