Mach number
E90366
Mach number is a dimensionless quantity in fluid dynamics and aerodynamics that expresses the ratio of an object's speed to the local speed of sound, commonly used to characterize subsonic, transonic, supersonic, and hypersonic flows.
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
aerodynamic parameter
→
dimensionless quantity → fluid dynamics parameter → physical quantity → |
| alsoDenotedAs | Ma → |
| definedAs | ratio of flow speed to local speed of sound → |
| dependsOn |
flow velocity
→
local speed of sound → temperature of the medium → thermodynamic properties of the fluid → |
| dimension | dimensionless → |
| equalsOneMeaning | sonic condition → |
| field |
aerodynamics
→
fluid dynamics → |
| governs | compressibility effects → |
| greaterThanOneMeaning | supersonic condition → |
| influences |
aeroacoustic phenomena
→
drag characteristics → lift characteristics → pressure distribution around bodies → shock formation → |
| lessThanOneMeaning | subsonic condition → |
| namedAfter | Ernst Mach → |
| relatedConcept |
Froude number
→
Knudsen number → Reynolds number → |
| relatedTo | speed of sound → |
| symbol | M → |
| typicalRangeHypersonic | M ≥ 5 → |
| typicalRangeSubsonic | M < 0.8 → |
| typicalRangeSupersonic | 1.2 < M < 5 → |
| typicalRangeTransonic | 0.8 ≤ M ≤ 1.2 → |
| usedFor |
analyzing expansion waves
→
analyzing shock waves → classifying aircraft speed regimes → classifying missile speed regimes → classifying spacecraft atmospheric flight regimes → nozzle flow characterization → turbomachinery analysis → wind tunnel testing conditions → |
| usedIn |
aerodynamic design
→
compressible flow analysis → gas dynamics → high-speed aerodynamics → |
| usedToCharacterize |
aerodynamic regimes
→
hypersonic flow → subsonic flow → supersonic flow → transonic flow → |
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.