Voltaic cells and electrolytic cells are similar because:
both cells use a salt bridge to keep the electrons flowing within the cells.
both cells have a positive anode.
both cells have a negative cathode.
both cells require the input of energy.

Some liquids can be distilled, but only at temperatures that are so high that it is impractical, or so high the compound decomposes. explain why distillation such compounds at significantly less than atmospheric pressure (some degree of vacuum) would solve this problem.