Windows Phone 8.1 arrived last year, finally bringing many features lacking from Microsoft's platform. Now, Microsoft is on the verge of rebooting once again with Windows 10 Mobile. Windows Phone has been rebooted enough. With constant Windows Phone change, the only thing that has remained persistent is a lack of apps.
Part of the Electronics glossary: The dielectric constant is the ratio of the permittivity of a substance to the permittivity of free space. It is an expression of the extent to which a material concentrates electric flux, and is the electrical equivalent of relative magnetic permeability.
Electricity. the ratio of the flux density produced by an electric field in a given dielectric to the flux density produced by that field in a vacuum. Also called dielectric constant, relative permittivity, specific inductive capacity. Origin of permittivity.