the.com/permittivity
How hard a material makes an electric field work to get through it.
means A measure of how much a material resists or supports the formation of an electric field within it, compared to a vacuum.
from Built from 'permit' (from Latin permittere, to let pass or allow through) plus the noun-forming suffix '-ivity' seen in words like 'sensitivity' and 'conductivity.' Physicists coined it in the 19th century, as the mathematics of electric fields in different materials (vacuum, glass, air) was being worked out, needing a word for exactly this property: how readily a substance lets an electric field 'through' or establish itself inside it.
- vacuum value
- never zero, sets the universal speed limit
- symbol
- epsilon, Greek letter cosplaying as physics
- relative form
- dielectric constant, same idea, friendlier name
- capacitors depend
- higher permittivity means more charge stored