Keywords: Prandtl-Glauert singularity.svg Sketch about Prandtl-Glauert singularity Szkic do objaśnienia zjawiska obłoku Prandtla-Glauerta self-made based on pl Image Cloud png 2007-09-04 Jacek FH Image Prandtl-Glauert singularity-en svg Inkscape Compressible flow |