Ireally like this guy and he is showing signs like as if he likes me but i still think he likes me as a friend. what do i do? do i tell him i like him or not because it might ruin our friendship?

I would Tell him, It would strengthen a friendship... or change to relationship

the electrical  conductivity  of asolution  of an electrolyte is measured by determining the resistance of thesolution  between two flat or cylindrical electrodes separated by a fixed distance.