______ is an index of the fractional pore space in soil that relates space to the volume of solids rather than to the total volume of the soil.
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The relationship between porosity (\( n \)) and void ratio (\( e \)) is given by:
\( e = \frac{n}{1-n} \) and \( n = \frac{e}{1+e} \).
Remember: Void ratio can be $> 1.0$, but porosity is always $< 1.0$ (or $< 100\%$).