Questions

A promise. 

The Promise made to somebody by you can be break but you cannot touch it.

The first oil well was dug in 1859. The oil production has since declined but it retains its name for high grade oil

In general, polar solvents dissolve polar solutes, and nonpolar solvents dissolve nonpolar solutes.
As water molecules are polar, polar molecules dissolves in water.

Resistivity :

Resistivity is a measure of the resistance to the flow of electrons. 

Conductivity :

Conductivity is just the inverse of resistivity, σ = 1/ρ, where σ is conductivity and ρ is resistivity.

Example:

Think of a pipe and water, the bigger the pipe, the easier water can flow and thus the lower the resistance. 

The Asia Pacific Summit 2018 began in Kathmandu, Nepal.