Question

What is the name for the percentage of space not occupied by solid matter in soil?

Answer 1

Answer: Porosity

Explanation: Porosity is the ratio of volume of pores to the total volume of soil. This ratio varies between 0 and 1, or  between 0% and 100% as a percentage.

$Porosity=\frac{\text {volume of pores}}{\text {Total volume}}\times 100\%$

Porosity is also called as void fraction and  is a measure of the empty spaces present in a material. Thus a porous soil will have more amount of  air and less porous soil will have less amount of  air.

A porous soil is made from coarse particles that leave large gaps known as pores.

Answer 2

The name for the percentage of space not occupied by solid matter in soil is called "porosity".