NF X11-621:1975 Determination of the area per unit mass of powders (specific surface) by means of gas adsorption. B.E.T. method:volumetric measurement of the adsorption of nitrogen at low temperatures.
1975NF X11-621:1975 Determination of the area per unit mass of powders (specific surface) by means of gas adsorption. B.E.T. method:volumetric measurement of the adsorption of nitrogen at low temperatures.