Aluminium is more expensive than iron. why is aluminium and not iron used for the central core in power cables?

a  solution  is always transparent, light passes through with no scattering from solute particles which are molecule in size. the  solution  is homogeneous and does not settle out. a colloid is intermediate between asolution  and a  suspension. while asuspension  will separate out a colloid will not.

the dependant variable is spilled water

the independent is the heat