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Air pressure

Definition

noun

(1) The pressure caused by the weight of air.

(2) The force exerted by air per unit area.


Supplement

Air pressure gradient inside and outside the chest cavity has a vital role in the mechanism of breathing. For instance, when the air pressure inside the chest cavity is greater than the outside, air flows out of the lungs, thus, we exhale. When the air pressure outside the chest cavity is greater than the inside, air flows into the lungs, thus, we inhale.

Pressure equalization on both ears is a function of the eustachian tube. Normally the tube is closed but it can open to let a small amount of air through in order to equalize the air between the middle ear and the atmosphere.


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Elastic cytoplasm film.

... used as a separation between two chambers with a different (changing) air pressure, this means the film needs to be elastic to move in and outward. Who can help me?

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by efteling7
Wed Apr 09, 2014 12:59 pm
 
Forum: General Discussion
Topic: Elastic cytoplasm film.
Replies: 4
Views: 928

Re: Can Systolic BP ever be less than Diastolic?

... have a heart on the right side, instead of left - but systolic blood pressure being lower than diastolic blood pressure just doesn't make sense. ... I am no doctor, but I think this is impossible. It's like asking if air pressure inside a balloon is higher when you fill the balloon with air, ...

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by teju85
Wed Nov 13, 2013 10:48 pm
 
Forum: Human Biology
Topic: Can Systolic BP ever be less than Diastolic?
Replies: 5
Views: 4320

Re: oxygen "grabbers" haemoglobin adaptation?

... of most pain and heart attacks, completely ignore the influence of pressure . Yet, to an engineer there is a simple and obvious relationship ... have the ability to tightly close their nostrils to avoid inhaling airborne sand in the desert. As they exhale, the restricted nasal passage ...

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by animartco
Sat Aug 31, 2013 2:54 pm
 
Forum: General Discussion
Topic: oxygen "grabbers" haemoglobin adaptation?
Replies: 7
Views: 6914

Re: oxygen "grabbers" haemoglobin adaptation?

... of most pain and heart attacks, completely ignore the influence of pressure . Yet, to an engineer there is a simple and obvious relationship ... have the ability to tightly close their nostrils to avoid inhaling airborne sand in the desert. As they exhale, the restricted nasal passage ...

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by DDD
Wed Aug 07, 2013 12:35 pm
 
Forum: General Discussion
Topic: oxygen "grabbers" haemoglobin adaptation?
Replies: 7
Views: 6914

How will conc. on 2 sides be equal when osmosis stops?

could you please explain why osmotic pressure will be equal since osmotic pressure is directly proportional to the centration of solute? and the air pressure is the same

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by kochibaza
Wed Dec 19, 2012 5:52 am
 
Forum: Physiology
Topic: How will conc. on 2 sides be equal when osmosis stops?
Replies: 4
Views: 7990
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