Question

What is the meaning of zero air voids line?

Answer 1

zero air voids means a line that contains the nitrogen

Answer 2

Thus, it can be visualized that an increase of dry density means a decrease of voids ratio and a more compact soil. Similarly, dry density can be related to percentage air voids (na) as. The relation between moisture content and dry unit weight for a saturated soil is the zero air-voids line.