Atmospheric Properties Questions
The successful flight of vehicles through the air depends on a thorough understanding of that medium through which
they must fly. Subjects covered in this section include the fundamental properties of the atmosphere, how they
vary, and the effects they have on flight.
How does the air density affect an airplane?
I am in need of the equations used to compute the atmospheric pressure in
pounds per square inch (psi) in your Atmospheric Properties Calculator. ... Can you share your pressure
calculation?
What is the speed of sound? How fast is Mach 1? What is the sound
barrier? How fast do you have to go to break the sound barrier? How fast is the speed of sound at ground
level? What does the term Mach number mean? What is the speed of an aircraft traveling at Mach 3 at an
altitude of 30,000 feet? What is subsonic speed?
Your site refers to the term sound barrier as "a popular part of human speech."
...it is shameful to see such chauvinism in a site purporting to provide facts...
Your site and many others list the speed of sound as 761 mph, but an
equal number of other sites say 742 mph. Which value is right? Why are they different?
How fast in miles per hour is Mach 2?
How fast is Mach 1 at sea level and in the Tropopause in mph and knots?
What is the exact speed of sound?
How fast is Mach 1, Mach 2, Mach 4, Mach 6, Mach 15, Mach 20, etc. at
different altitudes?
How can I calculate the speed of sound on Mars?
Does sound travel faster through a solid, a liquid, or a gas? Explain please.
We teach that the atmosphere is 80,000 ft high and the halfway point,
where half of all gases and pressure run out, is 18,000 ft. This seems wrong somehow. Please tell me what
these numbers represent.
You say that wind, not the Earth's rotation, causes the differences in
flight times to the east or west. But what causes the headwind and tailwind? Maybe...the rotation of the
Earth...So maybe, the difference in travel time is still explained by the rotation of the Earth?
What causes a hurricane? Why is a hurricane so destructive?
Which type of planes produce contrails? fighters? supersonic? or
passenger planes?
I took pictures of a strange contrail. I was in San Francisco facing
west to southwest towards the Pacific. The interval between the first and last pictures was around ten
minutes. Can you please take a look and explain them?
What is the atmospheric pressure inside a typical commercial
airliner?
Whenever I fly and the airplane is descending from altitude, my ears
and forehead hurt so badly I feel like my head will explode. Why is that?
Since space is a vacuum with no atmosphere, what would happen to an
astronaut suddenly exposed to space without a protective suit? I've had arguments with friends about the
scene in the movie 2001 when the astronaut is blown from one spacecraft to another without wearing a suit.
Would the person die instantly or survive, and for how long? What kinds of injuries would the body sustain
or would it simply explode? If an astronaut took a deep breath, opened and shut his helmet as fast as he
could, would he live?
Do other planets have weather like Earth? Do they have storms, rain,
hurricanes, lightning, or snow? Does Mercury or the Moon have an atmosphere? Is there wind on the
Moon?
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