What do you mean by one coulomb of charge?

What do you mean by precision?

What do you mean by leaching?

What do you mean by ozone hole ?What are its consequences ?

What do you mean by eddy current?

What do you mean by zero order of a reaction?

Principle of homogeneity is based on the fact that two quantities of same nature can be added. What do you mean by principal of homogeneity?