"De laval nozzle"@en . . . . "It is used as a means of accelerating the flow of a gas passing through it."@en . . . "De Laval nozzle"@en . . . . . "Similar flow properties have been applied to jet streams within astrophysics. [1]"@en . . "Similar flow properties have been applied to jet streams within astrophysics. [1]"@en . . "It is used as a means of accelerating the flow of a gas passing through it."@en . .