" Classical Gas" is a 1968 instrumental by Mason Williams.

Classical Gas may also refer to:

• Classical Gas (Tommy Emmanuel album), a 1995 album by Tommy Emmanuel
• Classical Gas (Mason Williams and Mannheim Steamroller album), a 1987 album by Mason Williams and Mannheim Steamroller
• the properties of an ideal gas in classical physics

This disambiguation page lists articles associated with the title Classical Gas.
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