As both adsorption (with increasing pressure) and desorption (with decreasing pressure) points lie on the common curve, the adsorption of nitrogen appears completely reversible at 450 c.

• 因为吸附(压力增加)和解吸附(压力减少)的点都在同一条曲线上,所以氮气在450℃的吸附显得是完全可逆的。