The Strange–Rahman–Smith equation is used in the cryoporometry method of measuring porosity. 
NMR cryoporometry is a recent technique for measuring total porosity and pore size distributions. NMRC is based on two equations: the Gibbs–Thomson equation, which maps the melting point depression to pore size, and the Strange–Rahman–Smith equation, which maps the melted signal amplitude at a particular temperature to pore volume.
Equation.
If the pores of the porous material are filled with a liquid, then the incremental volume of the pores formula_1 with pore diameter between formula_2 and formula_3 may be obtained from the increase in melted liquid volume for an increase of temperature between formula_4 and formula_5 by:
formula_6
Where: formula_7 is the Gibbs–Thomson coefficient for the liquid in the pores.
References.
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