• Three states of matter exist – solid, liquid, and gas.
  • Each state has its own unique set of physical properties.
  • Mercury is the only metal we know of that is liquid at room temperature.
  • Mercury can be solidified when its temperature is brought to its freezing point.
  • However, when returned to room temperature conditions, mercury does not exist in solid state for long.
  • All substances can exist in any of these three states.
  • Technically speaking a fourth state of matter called plasma exists, but it does not naturally occur on earth.
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