Because Direct Materials Inventory reports the standard cost of the actual materials on hand, we reduce the account balance by $870 (290 yards used $3 standard cost per yard). After removing 290 yards of materials, the balance in the Direct Materials Inventory account is $2,130 (710 yards x $3 standard cost per yard).
void (plural voids) 1  An empty space; a vacuum. ( 2 astronomy) An extended region of space containing no galaxies. ( 3 materials science) A collection of adjacent vacancies inside a crystal lattice. ( 4 fluid mechanics) A pocket of vapour inside a fluid flow, created by cavitation.
From Wikipedia, the free encyclopedia. Porosity or void fraction is a measure of the void (i.e., empty) spaces in a material, and is a fraction of the volume of voids over the total volume, between 0 and 1, or as a percentage between 0 and 100%. There are many ways to test porosity in a substance or part, such as industrial CT scanning.