What is the name of the percentange of space not occcupied by solid matter in soil?

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 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.

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.

organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.