Strange–Rahman–Smith equation
Encyclopedia
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, that maps the melting point depression to pore size, and the Strange–Rahman–Smith equation that maps the melted signal amplitude at a particular temperature to pore volume.
) are filled with a liquid, then the volume of the pores 
at a particular pore diameter may be obtained from the melting point in the pores 
by :
Where:
is the Gibbs–Thomson coefficient
for the liquid in the pores.
NMR cryoporometry is a recent technique for measuring total porosity and pore size distributions. NMRC is based on two equations, the Gibbs–Thomson equation, that maps the melting point depression to pore size, and the Strange–Rahman–Smith equation that maps the melted signal amplitude at a particular temperature to pore volume.
Equation
If the pores of the porous material (of diameter ) are filled with a liquid, then the volume of the pores at a particular pore diameter may be obtained from the melting point in the pores by :Where:
is the Gibbs–Thomson coefficientGibbs–Thomson equation
The Gibbs–Thomson effect in Physics refers to the observation that small crystals of a liquid melt at a lower temperature than the bulk liquid.The melting point depression is inversely proportional to the pore size, as given by the Gibbs–Thomson equation....
for the liquid in the pores.