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Mach no. is dependant on ambient air temp which is associated with a given altitude. As one ascends the temp drops so does the mach no. Eg. In a standard atmosphere (ISA - international std atmosphere) sea level temp is 15 degrees C or 59 degrees F. Temp decreases at 2 degrees celcius per 1000' therefore for example, in a standard atmosphere the temp at say 30000' would be: 15C at 0' -45C at 30000' Plug that into the equation to find the Local Speed of Sound (LSS) which is: LSS = 38.945 (square root of)/ Outside air temp + Absolute temp being 273A or 273K LSS = 38.945 x 228 LSS = 588 kts at 30000' So if one is doing 480knots at 30000' on a standard, day they are doing 480/588 = Mach0.82

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Q: How does mach number vary with temperature and altitude?

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Most modern jet fighters have a maximum speed in the range of Mach 1.5. They cruise at around Mach .95. The actual velocity as measured through the air will vary depending on temperature and pressure, which in turn vary with altitude.

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Mach is the speed of sound in that medium, and is known as Mach 1. It will vary according to pressure and temperature. [More correctly, it is the dimensionless number relating the speed of an object to that of sound in that medium.] Mach does not have units associated with it, such as mph or kmph.

Temperature decreases with increasing altitude, Also air concentration decreases with altitude.

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'Mach ' is the speed of sound. This depends on air pressure and temperature. On a median day at sea level this is normally 761 mph. That figure can vary if air conditions are changed, but based on this common number, mach 4.5 is 3,324 mph.

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761.2 mph at sea level, though it will vary depending on temperature and atmospheric composition.Mach 1 is the speed of sound, approximately 768 miler per hour, but it will vary based on density of air, caused by humidity.The unit Mach doesn't have a direct conversion to mph, because Mach 1 is the speed of sound (Mach 2 is 2 times the speed of sound etc.) and the speed of sound changes with altitude, while mph stay the same regardless of altitude and therefore causes the conversion between the two units to vary. For example, at sea level the speed of sound is 761.2 mph, but at 18 miles of altitude the speed of sound is 673.4mph. Got to the following webpage for a table of the speed of sound (Mach 1) at different altitudes.Mach 1 or any other Mach number, is not a specific speed.Mach numbers refer to the speed of sound in that medium.Mach 1 is about 760 mph at sea level (+ or - 4-5 degrees depending on the temperature). Mach 1 decreases as you go to higher elevations.At 30000 ft Mach 1 is 678 mph (589 knots, 1091 km/h) which is about cruising altitude for an average commercial airplane. (1 knot=1.15078 mph / 1 mph=0.868976 knots)At what density altitude? Speed of sound slows with altitude. 761.05 mph at sea level on a normal day(60 degrees F, 29.92 barometric press.)It changes with weather, atmospheric conditions and altitude. Most accept 657 miles per hour at 10,000 as the speed of sound.

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