HI shows the volumetric concentration of hydrogen atoms in the substance normalized to the volumetric hydrogen concentration of water in standard conditions:
HI = \frac{9 \, n_H \, A_H}{\sum_i n_i \, A_i} \cdot \rho_B |
where
| rock density | |
| number of hydrogen atoms in molecule | |
| atomic mass of hydrogen in molecule | |
| number of i-th type of atoms in molecule | |
| atomic mass of i-th type of atoms in molecule |
For water in standard condition is HI =1.