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Can substances other than H2O have a triple point, where the three usual phases of matter (solid/liquid/gas) can exist?

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Yes, see this wikipedia entry:

http://en.wikipedia.org/wiki/Triple_point

which gives the example:

the triple point of mercury occurs at a temperature of −38.8344 °C and a pressure of 0.2 mPa.

and furthermore provides a table of triple points of various common substances:

http://en.wikipedia.org/wiki/Triple_point#Table_of_triple_points

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