Im working on a periodic table in vb.net and I want to start adding in the information for the density, melting point and boiling point for the elements. The problem that Im having is I need to find a source that I know has only entered these values for a specific temp and pressure. I prefer the temperature to be 20 celsius for the density and the pressure to be 1 atmosphere. Im going to use kelvin and g/cm3. Does anyone know of a source that always shows what pressure/temp its values are based on or a source that says up front that it is all based on a certain pressure and temp unless other-wise noted?