We say here about chemicals. Many chemicals use in medicines for healthy life. That is chemical theory of healthy use. Chemicals are in two type first one is Organic and second one is Inorganic. We take foods and get nutrition from foods for health requirements of human life. Get organic foods To fulfil need of human nutrition We take fruits, many types of planes parts. See here requirements of chemicals for human being body
The units of resistivity don't come out right.
10^-8 Ohm * m
m Ohm * cm
the 'm' should be a 'mu', but unfortunately they both look the same in the latin alphabet.