• Water loss to the atmosphere is a significant problem in many parts of the world.
  • When water supplies are low, anything that can be done to decrease water loss is important for farmers.
  • An evaporation pan can be used to measure how fast water evaporates in a given location.
  • Water has a high surface tension (attraction between molecules at the surface of a liquid) because of its hydrogen bonding.
  • Liquids that cannot hydrogen bond do not exhibit nearly as much surface tension.
  • Low vapor pressure is an important physical property of water since lakes, oceans, and other large bodies of water would all tend to evaporate much more quickly otherwise.
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