Materials: 150 ml of salt Aquarium or clear plastic box Aluminum Foil (for a more permanent demonstration set-up, use plexiglas, sturdy plastic or a thin panel of wood to make the barrier, fastening it in place with waterproof caulk.
(a more permanent demonstration set-up; fastening; it; L:in place)
a more permanent demonstration set-up
fastening
it L:in place