distillation and desalination

Question 1

definition of distillation and desalination

Answer 1

separating pure liquid from a solution by evaporation and condensation
distilling sea water to get fresh water (removing all salt)

Question 2

how can sea water be distilled on a small scale

Answer 2

with a solar still

Question 3

how can sea water be distilled on a larger scale but why is it impractical

Answer 3

with a traditional distillation apparatus. usually involves burning fossil fuels to heat the water = needs lots of energy = expensive = not a viable process in poorer countries