To calculate the nuclear density of oxygen, one must consider its molar mass of 15.9994 and the appropriate volume, which varies depending on whether the focus is on the gas or the atomic nucleus. At standard temperature and pressure (STP), one mole of gas occupies 22.4 dm^3, but this does not apply to nuclear density calculations. The discussion also highlights the distinction between atomic densities of gases, liquids, and solids, which are temperature-dependent. Additionally, there is a mention of Avogadro's number and its historical context, noting that it is sometimes referred to as Loschmidt's number in German-speaking countries. Understanding these concepts is crucial for accurately calculating the density of oxygen in different states.
