
This function calculates the temperature and pressure dependent density of pure water.
density_h2o(tc, pa)
double, kg/m^3.
double, air temperature, degrees C.
double, atm pressure, Pa.
Chen, C.T., Fine, R.A. and Millero, F.J., 1977. The equation of state of pure water determined from sound speeds. The Journal of Chemical Physics, 66(5), pp.2142-2144. tools:::Rd_expr_doi("10.1063/1.434179")