Subsonic vs. Supersonic: Know the Difference
By Shumaila Saeed || Updated on December 25, 2023
Subsonic speeds are below the speed of sound (< Mach 1), while supersonic speeds exceed the speed of sound (> Mach 1).
Key Differences
Subsonic refers to speeds less than the speed of sound, typically below Mach 1. In contrast, Supersonic speeds are those that surpass the speed of sound, generally exceeding Mach 1. This distinction is crucial in aerodynamics and aviation.
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Nov 24, 2023
In Subsonic flight, air flows smoothly around the object, with no shock waves. Supersonic flight, however, involves shock waves, leading to sharp changes in pressure and temperature, significantly affecting aircraft design.
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Nov 24, 2023
The sonic boom is a phenomenon absent in Subsonic travel but prominent in Supersonic speeds. It's a loud sound associated with the shock waves created when an object travels faster than the speed of sound.
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Subsonic speeds are common in commercial aviation, ensuring fuel efficiency and lower noise levels. On the other hand, Supersonic speeds are typical in military jets and some specialized commercial planes, offering rapid transit but at higher costs and noise.
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In terms of control and stability, Subsonic aircraft designs differ significantly from Supersonic designs. The latter requires special considerations for handling high-speed aerodynamic forces.
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Comparison Chart
Speed Relative to Sound
Below the speed of sound (< Mach 1)
Above the speed of sound (> Mach 1)
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Subsonic and Supersonic Definitions
Subsonic
Characterized by the absence of a sonic boom.
In subsonic flight, the quietness is due to the lack of sonic booms.
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Supersonic
Exceeding the speed of sound, typically above Mach 1.
The fighter jet broke the sound barrier, achieving supersonic speed.
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Subsonic
Describing motion slower than sound waves in a given medium.
The subsonic bullet traveled slower than the speed of sound.
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Supersonic
Relating to velocities that greatly exceed the speed of sound.
Supersonic missiles can reach their targets much faster than subsonic ones.
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Subsonic
Pertaining to speeds lower than the speed of sound.
The passenger plane flew at a subsonic speed for fuel efficiency.
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Supersonic
Involving high-speed dynamics in aerodynamics.
Supersonic flows are studied extensively in high-speed aerospace engineering.
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Subsonic
Relating to sound frequencies below the audible range.
Subsonic vibrations are often felt rather than heard.
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Supersonic
Pertaining to speeds where shock waves form.
Supersonic flight requires advanced aerodynamic design to handle shock waves.
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Subsonic
Involving velocities less than Mach 1.
Subsonic aircraft are designed for stability at lower speeds.
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Supersonic
Associated with the production of a sonic boom.
The supersonic aircraft's passage was marked by a loud sonic boom.
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Supersonic
Having, caused by, or relating to a speed greater than the speed of sound in a given medium, especially air.
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Oct 19, 2023
Supersonic
Of or relating to sound waves with a frequency above the range audible to the human ear; ultrasonic.
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Supersonic
(of a speed) Greater than the speed of sound (in the same medium, and at the same temperature and pressure).
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Subsonic
(of a sound, literary) very quiet, almost inaudible
The noise of the ship was all around her. The faint subsonic rumble of the reactor and drive. (Leviathan Wakes, James S. A. Corey)
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Subsonic
(of a speed) (aviation) less than the speed of sound (in the same medium, and at the same temperature and pressure)
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Subsonic
With a Mach number such that 0.3 < Ma < 0.8 (approximately - the exact limits vary between sources)
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Supersonic
Moving at a speed greater than the speed of sound in air; - this speed varies with altitude, since the speed of sound varies with altitude, as well as with temperature and humidity, being approximately 1129 feet per second at sea level and 984 feet per second at 16 miles altitude.
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Supersonic
Capable of moving at speeds higher than the speed of sound; - of aircraft.
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Subsonic
(of speed) less than that of sound in a designated medium;
Aircraft flying at subsonic speeds
A supersonic bomber flies so fast that it must release its bombs while the target is still over the horizon
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Supersonic
(of speed) greater than the speed of sound in a given medium (especially air);
A supersonic bomber flies so fast that it must release its bombs while the target is still over the horizon
Aircraft flying at subsonic speeds
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Repeatedly Asked Queries
Does supersonic travel always produce a sonic boom?
Yes, traveling faster than sound creates a sonic boom.
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Nov 24, 2023
What defines subsonic speed?
Speeds below the speed of sound, typically under Mach 1.
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What is supersonic speed?
Speeds that exceed the speed of sound, generally over Mach 1.
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Are subsonic speeds quieter than supersonic?
Yes, subsonic speeds are quieter due to the absence of sonic booms.
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Can supersonic speeds affect aircraft design?
Yes, supersonic speeds require special aerodynamic designs.
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Is supersonic travel faster than bullet trains?
Yes, supersonic speeds are significantly faster than bullet trains.
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Do supersonic objects always create loud noises?
Yes, due to the sonic boom and high-speed interaction with air.
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Can humans hear subsonic sounds?
Not if the frequencies are below the human audible range.
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Why are military jets often supersonic?
For rapid response and advantage in combat situations.
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Nov 24, 2023
Do subsonic speeds involve shock waves?
No, shock waves are absent at subsonic speeds.
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Do subsonic speeds affect airplane takeoff and landing?
Yes, takeoff and landing are typically performed at subsonic speeds.
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Are commercial planes subsonic or supersonic?
Most commercial planes are subsonic for efficiency and noise reduction.
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Is subsonic travel more fuel-efficient?
Yes, subsonic speeds are generally more fuel-efficient.
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Are subsonic speeds safer for passenger planes?
Generally yes, due to lower stress on the aircraft structure.
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Why aren't commercial flights supersonic?
Due to higher costs, noise, and fuel inefficiency.
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Can birds or animals achieve supersonic speed?
No, supersonic speeds are beyond the capability of birds and animals.
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Can sound travel at supersonic speeds?
Sound itself travels at a constant speed, defined as subsonic, in a given medium.
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Are subsonic waves detectable by human ears?
Yes, if they are within the audible frequency range.
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Is supersonic travel common in space exploration?
Spacecraft often exceed supersonic speeds during launch and re-entry.
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Nov 24, 2023
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About Author
Written by
Shumaila SaeedShumaila Saeed, an expert content creator with 6 years of experience, specializes in distilling complex topics into easily digestible comparisons, shining a light on the nuances that both inform and educate readers with clarity and accuracy.
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