What do you mean by precision?

What do you mean by polarizing angle?

What do you mean by leaching?

a) Acid rain causes extensive damage to vegetation and aquatic life. i) What do you mean by acid rain?

What do you mean by persistence of vision?

What do you mean by a seconds pendulum?

What do you mean by spring constant?

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?

Copper is one of the suitable material to make connecting wires due to its low resistivity. What do you mean by resistivity?