Quantum redactiones paginae "Numerus Machianus" differant
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[[Fasciculus:FA-18 Hornet breaking sound barrier (7 July 1999).jpg|thumb|[[McDonnell Douglas F/A-18 Hornet|F/A-18 Hornet]] [[Vapor conus|vaporem conum]] creans ([[Expansio Prandtl–Meyer|flabellum expansionis Prandtl–Meyer]]).]]
'''Numerus Machianus''' (abbreviatura '''M''' vel '''Ma''') est [[quantitas sine dimensione]] in [[mechanica fluidorum]] ratio enim inter velocitatem <math>v</math> [[corpus physicum|corporis]] vel [[fluidum|fluidi]] et [[Celeritas soni|celeritatem soni]] <math>c</math> eius cingenti.
:<math>\mathrm{M} = \frac {u}{c},</math>
quo
* M < 0.7 — corpus vel fluidum ''tardius'' quam sonum cingentem esse significans fluxus ''subsonicus'',
* 0.7 < M < 1.2<ref NAME="ALIA">fons alia: 1.0</ref> —
* 1.2<ref name="ALIA" /> < M < 5.0 —
* M > 5.0 —
designant.
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