A new method is proposed to estimation of hydrogen pressure in equilibrium with hydride phase in a hydrogen storage material. It is applicable both for hydrogen absorption and desorption in cases where the hydride phase is formed by nucleation and growth mechanism. The proposed method saves considerably the experimental time replacing the conventional time consuming measurement of pressure-composition isotherms, the so called PCT curves. The proposed evaluation procedure is illustrated using hydrogen chemi-sorption at temperatures 623 K, 573 K and 523 K in chosen hydrogen storage alloys Mg-Si-C, Mg-Li-C and Mg-Na-C.Keywords: Hydrogen storage, magnesium, new method
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