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.
With solar you can secure predictable electricity costs for years to come. Save Money. In most states, solar costs less than energy from the utility, so you can save on your bill. Help the Environment. Solar creates 91% less CO2 pollution than natural gas and 96% less CO2 than coal.