The density of oxygen depends on its state (gas, liquid, or solid) and the temperature and pressure conditions. Here are some common values:

* Oxygen gas (O2) at standard temperature and pressure (STP, 0°C and 1 atm): 1.429 g/L

* Liquid oxygen (O2) at its boiling point (-183°C): 1.141 g/mL

* Solid oxygen (O2) at its melting point (-218°C): 1.33 g/mL

Note: These are just approximate values, and the actual density can vary slightly depending on the specific conditions.