O2 and Cypriot airliner crash

If the pressure drop is rapid, they need to exhale, otherwise their lungs
will burst. Just like surfacing in scuba diving.

--
Bert Willing

ASW20 "TW"


"Eric Greenwell" a écrit dans le message de news:
...
Bucky wrote:

wrote:

40,000 15 seconds
35.000 20 seconds
30,000 30 seconds


I don't get it. Can't a person stay conscious for longer than 30
seconds without breathing? Most people can hold their breath for over
a minute.

If the drop in pressure is rapid, can a person hold in the air? Or perhaps
it is expelled because the pressure in the lungs is double the cabin
pressure?


--
Change "netto" to "net" to email me directly

Eric Greenwell
Washington State
USA

"Bert Willing" wrote in
message ...
If the pressure drop is rapid, they need to exhale, otherwise their lungs
will burst. Just like surfacing in scuba diving.

I don't believe there's ever been a case of pulmonary barotrauma (absent of
prior lung pathology) from decompression in commercial aviation. The
differential between 50,000' and 8,000' is less than that typically involved
in scuba incidents. May be possible though.

moo

Bucky wrote:

I don't get it. Can't a person stay conscious for longer than 30
seconds without breathing? Most people can hold their breath for over
a minute.

If the aircraft loses pressure at 35,000', you cannot hold your breath. The
pressure difference will force you to exhale. Nothing you can do about it.

But that's not the biggest deal. The biggest problem is the fact that the
ambient pressure at that altitude is too low to keep oxygen in your bloodstream.
All the oxygen immediately begins to flow out of your bloodstream into your
lungs and out into the surrounding air. It doesn't matter whether you breathe
or not.

George Patterson
Give a person a fish and you feed him for a day; teach a person to
use the Internet and he won't bother you for weeks.

On Mon, 15 Aug 2005 18:54:18 GMT, George Patterson wrote:

If the aircraft loses pressure at 35,000', you cannot hold your breath. The
pressure difference will force you to exhale. Nothing you can do about it.

but apparently there was enough time to write a short message on the cell
phone and send it - if one can trust the news (*doh*).

#m


--
The most likely way for the world to be destroyed,
most experts agree, is by accident. That's where we
come in; we're computer professionals. We cause accidents.
-- Nathaniel Borenstein

In article , Martin Hotze wrote:
On Mon, 15 Aug 2005 18:54:18 GMT, George Patterson wrote:

If the aircraft loses pressure at 35,000', you cannot hold your breath. The
pressure difference will force you to exhale. Nothing you can do about it.

but apparently there was enough time to write a short message on the cell
phone and send it - if one can trust the news (*doh*).

They arrested the person whom reported it a short time ago, it
apparently being a disgusting and cruel hoax.

-Dan

On Mon, 15 Aug 2005 21:08:03 +0000 (UTC), Dan Foster wrote:

but apparently there was enough time to write a short message on the cell
phone and send it - if one can trust the news (*doh*).

They arrested the person whom reported it a short time ago, it
apparently being a disgusting and cruel hoax.

thanks for the info. I have to check that.

-Dan

#m

--
The most likely way for the world to be destroyed,
most experts agree, is by accident. That's where we
come in; we're computer professionals. We cause accidents.
-- Nathaniel Borenstein

Martin Hotze wrote:

On Mon, 15 Aug 2005 18:54:18 GMT, George Patterson wrote:


If the aircraft loses pressure at 35,000', you cannot hold your breath. The
pressure difference will force you to exhale. Nothing you can do about it.


but apparently there was enough time to write a short message on the cell
phone and send it - if one can trust the news (*doh*).

You can't.

Matt

Bucky wrote:
wrote:
40,000 15 seconds
35.000 20 seconds
30,000 30 seconds

I don't get it. Can't a person stay conscious for longer than 30
seconds without breathing? Most people can hold their breath for over
a minute.

If you try to hold your breath your lungs will explode when the outside
pressure drops. That's why in altitude chambers they never tell you when
they're going to give the explosive decompression. When it happens the air
in your lungs automatically expels from your body since it is at a much
higher pressure than the ambient air. Pressure breathing through an oxygen
mask is difficult since your must manually forcibly exhale and just relax to
inhale.

--

Darrell R. Schmidt
B-58 Hustler History: http://members.cox.net/dschmidt1/
-

The chart is for time of USEFUL consciousness. The part where the pilot
starts thinking "I feel really great. Look how beautiful the scenery is.
The cold is my friend...." isn't useful consciousness.
"Bucky" wrote in message
oups.com...
wrote:
40,000 15 seconds
35.000 20 seconds
30,000 30 seconds

I don't get it. Can't a person stay conscious for longer than 30
seconds without breathing? Most people can hold their breath for over
a minute.

The "partial pressure of O2" has nothing to do with it.

Your premise is wrong. Loss of cabin pressure IS what incapacitates
pilots. The lungs need atmospheric pressure to exchange gasses with
hemoglobin in the alveoli. It doesn't matter what gas it is - without
the pressure, respiration stops happening. As altitude increases and
pressure decreases, respiration becomes less effective. Below a
certain pressure, you can suffocate on 100% oxygen.