Mach meter - définition. Qu'est-ce que Mach meter
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Qu'est-ce (qui) est Mach meter - définition

FLIGHT INSTRUMENT
Mach limit; Mach meter; Mach number indicator

Machmeter         
['m?:kmi:t?, 'mak-]
¦ noun an instrument in an aircraft indicating airspeed as a Mach number.
Mach number         
  • The speed of sound (blue) depends only on the temperature variation at altitude (red) and can be calculated from it since isolated density and pressure effects on the speed of sound cancel each other. The speed of sound increases with height in two regions of the stratosphere and thermosphere, due to heating effects in these regions.
  • 300px
  • 300px
RATIO OF SPEED OF OBJECT MOVING THROUGH FLUID AND SPEED OF SOUND
Mach (speed); Mach Number; Mach speed; Mach 5 (speed)
Mach number (M or Ma) (; ) is a dimensionless quantity in fluid dynamics representing the ratio of flow velocity past a boundary to the local speed of sound.
exposure meter         
  • CdS]] [[photoresistor]], in opening at left.
  • Analog handheld light meter - Gossen Lunasix 3 (in US: Luna Pro S); available from 1961 to 1977
  • HortiPower spectrum meter to measure Photon Flux Density (light for plants)
  • Kodalux
  • Leica IIIC with Voigtlander VC Meter II
  • Leudi extinction meter
  • Metrophot
  • Sekonic Twinmate L208
  • Sekonic<br />L-358 Flash Master<br />A handheld digital light meter showing an exposure of 1/200th at an aperture of f/11, at ISO 100. The light sensor is on top, under the white diffusing hemisphere.
  • Tessina Meter
  • Voigtlander VC Meter
DEVICE FOR MEASURING LUMINOSITY
Exposure Meter; Posemeter; Light Meter; Luxmeter; Exposure meter; Lightmeter; Lux meter; CdS meter; Light metering; Light-metering
¦ noun Photography a light meter.

Wikipédia

Machmeter

A Machmeter is an aircraft pitot-static system flight instrument that shows the ratio of the true airspeed to the speed of sound, a dimensionless quantity called Mach number. This is shown on a Machmeter as a decimal fraction. An aircraft flying at the speed of sound is flying at a Mach number of one, expressed as Mach 1.