Polarity and Boiling Point: The polarity of the molecules determines the forces of attraction between the molecules in the liquid state. Polar molecules are attracted by the opposite charge effect (the positive end of one molecule is attracted to the negative end of another molecule.
The five disadvantages of solar power. It's intermittent. Solar energy is only available when the sun is shining. It's low efficiency. It requires large areas of land. It's not completely free of environmental impact. Ultrapure polysilicon is now scarce. It's high cost.
Sun Powered Dehydrators. The advantage to buying or making a solar dehydrator is the savings on electricity. You use sun power to dry the food. The problem with solar dehydrators is nature is unpredictable. If there's no sun, you won't be able to use the food dryer. Also, sun dryers rely on sunlight for heat to pull water.