Dimension of density of physical vacuum (ether) is found, its physical interpretation is given. Equivalence of dimensions of physical quantities generated by an ether to dimensions of physical quantities traditionally used in physics is shown. New systems of units of measurements of the physical quantities, based on density of ether are offered and analyzed. The new form of the equation for speed of distribution of perturbations, simplifying the analytical and numerical solution of system of the equations is obtained. Some mathematical properties of the equations of ether are formulated, their interpretation is offered and possible practical application is discussed.