Definition Density refers to the mass contained within a unit volume under specified conditions. Notes Data given here refer to the solid.
Density is temperature dependent and different allotopes of one element possess different densities.
Where possible, values are given at or near ambient temperature, hopefully of the thermodynamically most favoured allotrope. A.M. James and M.P. Lord in Macmillan's Chemical and Physical Data , Macmillan, London, UK, 1992. G.W.C. Kaye and T.H. Laby in Tables of physical and chemical constants , Longman, London, UK, 15th edition, 1993.