Relation between mach no. and temperature
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The term 'Mach' refers to the speed of sound in air, that is corrected for temperature, humidity, and pressure. Temperature and pressure go hand in hand, atmospherically speaking. The warmer the air, the lower the density, thus lower the speed of sound, therefore the higher your speed over the ground to achieve the same Mach number.
There are two kinds of speed we are talking about, one is 'airspeed' - your speed through the air. The other is 'ground speed' - obviously, your speed over the ground. A Mach number is a measure of airspeed, and not of ground speed. Mach is said to change when 1.0 Mach refers to different ground speeds.
A sudden change of temperature will change the propulsion of a jet engine, and more importantly, it will change the way the wing reacts. When jets line up for a formation takeoff, the one in the back is usually sucking hot air from the tailpipe of the ones in front of him. Four things are bad for flying - the four H's: heavy, hot, humid, and high. Heavy is obvious. Hot, humid and high are all related, since any one of these conditions (and worse - more than one) decrease the performance of your airplane.
There are two kinds of speed we are talking about, one is 'airspeed' - your speed through the air. The other is 'ground speed' - obviously, your speed over the ground. A Mach number is a measure of airspeed, and not of ground speed. Mach is said to change when 1.0 Mach refers to different ground speeds.
A sudden change of temperature will change the propulsion of a jet engine, and more importantly, it will change the way the wing reacts. When jets line up for a formation takeoff, the one in the back is usually sucking hot air from the tailpipe of the ones in front of him. Four things are bad for flying - the four H's: heavy, hot, humid, and high. Heavy is obvious. Hot, humid and high are all related, since any one of these conditions (and worse - more than one) decrease the performance of your airplane.
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