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How high can you suck water up a straw if The pressure in the lungs can be reduced to about 5 kPa below atmospheric pressure?
Jvelasq1
The pressure 5kPA is about 0.725psi or 104.4lbs/sqft. (we're using feet for the cross section of the straw so that we can use it easily for the height)
We know that water has a density of 62.4lbs/ft^2.
Therefore, we divide the weight of the water that we can suck up the straw at 5kPa by the density of water. We get the volume of water that we can move. (104.4lbs) / (62.4lbs/ft^3) = 1.67ft^3 Since our column is a 1ft x 1ft column, water will be able to be lifted to 1.67ft.
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∙ 13y ago
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What is the expected pressure of air in lungs of a diver at 4 meters below the sea level?
Air pressure (at sea level) is about 1 bar; every 10 meters below the water surface, pressure increases by about 1 bar - that gives a total of 1 + 0.4 = 1.4 bar. (1 bar is about 1 atmosphere.)
Why does a bubble grow and move faster as it ascends?
Atmospheric pressure at ground level is higher than at a greater altitude, therefore as the bubble rises the atmospheric pressure on it's surface decreases creating less of a squashing effect on the bubble, making it expand. The impetus for it's upward climb is that the warm air from your lungs is less dense and therefore is forced upwards by the cooler external air. As atmospheric pressure reduces at greater altitude the bubble becomes less dense, accelerating it's upward climb. The reduction in pressure decreases and the bubble continues to expand until it's molecular bonds become strained and the bubble bursts.
How does increasing pressure in a chamber help treat the bends?
Spending time in a barometric chamber (in which the pressure is raised above atmospheric) causes nitrogen bubbles in the blood stream (the cause of the bends) to go back into solution and gives the nitrogen the opportunity to exit the body via the lungs so that it won't come back out of solution when the pressure is lowered.
What part of a diver's body might be hurt during a deep dive and why is this so?
During the deep dive the divers body goes through immense pressure. The atmospheric pressure in the deep as one goes more deep it increases so the lungs of the diver has to do more work and also that if the diver comes up on surface faster ten the rate he went down then the helim would be formed in the lungs of diver which can be lethal.
Where in the body would you find the diaphragam?
The diaphragm is the muscle below the lungs, and above the stomach, responsible for breathing. The diaphragm works by pulling tighter, thus decreasing the pressure in the lungs, pulling air in through the trachea. To exhale, the diaphragm relaxes, and chest muscles contract, pushing the air back out.
What happens when pressure is lower inside the lungs than outside the lungs?
atmospheric
Why does the lung collapse if intrapleural pressure is not maintain?
Inspiration happens when the pressure inside the lungs is lower than the atmospheric pressure (outside) and air rushes into the lungs. Expiration is when the air inside the lungs is higher than the atmospheric pressure and the air rushes out of the lungs. If the intrapleural pressure (pressure within the pleura of the lungs) isn't maintained then the pressure in the lungs can't differentiate between inspiration and expiration and so the lung collapses.
When the lungs are at rest between breathing cycle the air pressure in the lungs is?
Air goes into or out of the lungs due to differential pressure. On inhalation, the pressure within the lungs is below atmospheric, so outside air rushes in. On exhalation, the pressure within the lungs is above atmopheric, so inside air rushes out. When you stop breathing for the moment at the end of exhalation, or when you transition from inhalation to exhalation at the end of inhalation, there is no air flow, because there is no differential pressure. Assuming that you do not close your larynx, then, when the lungs are at rest, the air pressure in the lungs is the same as atmospheric, and this occurs twice in each complete breathing cycle.
What is the pressure difference between the external air and the pleural cavity when inhalation just begins?
In inspiration, intrapulmonary pressure drops 3mm/Hg below atmospheric pressure and air flows into the lungs.
In healthy lungs what pressure is always lower than atmospheric pressure?
Gee, that's a good question. Hmm... i'd say the atmospheric pressure would be lower because when you travel to higher altitudes like, Mt Everest, the pressure in your lungs decrease causing them to deflate the lungs.......Its Intrapleural pressure
What happens if intrapleural pressure equal atmospheric pressure?
The intrapleual pressure is always below atmospheric pressure. Because of the connection between the two plurae which is similar to two wet pieces of paper adhered to each other, the negative intrapleural pressure helps to expand the lungs during ventilation. If intrapleural pressure was equal to atmospheric pressure, the lungs would collapse. Such a case is seen in a penetration of the thoracic cavity (pneumothorax), where a puncture in the thoracic cavity, and subsequently the plurae, will result in a collapsed lung.
When does inspiration occur?
when atmospheric pressure is greater than the pressure within the lungs, inspiration occur.
Why does air flow in when you expand your lungs?
Since the volume of the lungs increases, the intrathotacic pressure decreases, and air moves into the lungs.
Is it true or false the force that drives air into the lungs come from air pressure?
No atmospheric pressure
When intraalveolar pressure exceeds atmospheric pressure what happens?
intrapleural pressure exceeds atmospheric pressure, but lungs don't collapse because intra-alveolar pressure increases, too (4 mmHg pressure gradient stays same)
What is Intrapulmonary pressure?
The intrapulmonary pressure is the pressure in the alveoli. Intrapulmonary pressure rises and falls with the phases of breathing, but it ALWAYS eventually equalizes with the atmospheric pressure.
Why is intrapleural pressure negative rather than positive?
Because the negative pressure is the major factor preventing the lungs from collapsing. If the intrapleural pressure became equal to atmospheric pressure the lungs would recoil and collapse.
