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Equal pressure point (EPP) is the point where Intrapleural pressure and Alveolar pressure are equal. This is similar to the Starling resistor concept in the lung. Instead of flow being determined by the difference between alveolar and mouth pressure- flow is determined by the difference between alveolar and Intrapleural pressure difference.
In forced expiration, both intrapleural pressure and alveolar pressure will increase. However alveolar pressure will decrease along the length of the airway until a pressure of zero at the mouth, whereas intrapleural pressure will remain the same. Therefore there will be a point where intrapleural pressure will be equal and subsequently greater than alveolar pressure.
If the EPP occurs in the larger cartilaginous airways, the airway remains open. However, if the EPP is in the smaller airways, it will collapse.
Increasing the force of expiration does not overcome EPP since it will increase both alveolar and intrapleural pressure.
Another interesting concept is that EPP moves distally as expiration progresses because as air leaves the alveolar unit, the pressure in the alveolar decreases hence the pressure in the airway decreases as well.
EPP is the cause of dynamic airway compression.
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The temperature at which the vapor pressure of a liquid is equal to the external pressure is the what?
The temperature at which the vapor pressure of a liquid is equal to the external pressure is known as the boiling point. At this point, the liquid changes to a gas by overcoming the external pressure.
What temperature does water boil and evaporates into steam?
boiling point is a property which depends upon the atmospheric pressure. when vapour pressure of water is equal to external is called its boiling point.. if pressure is equal to atmospheric pressure ,boiling point is 100 degree celcius.
The temperature at which the vapor pressure of a liquid is equal to the external pressure is?
The temperature at which the vapor pressure of a liquid equals the external pressure is called the boiling point. This is when the liquid changes into vapor at a constant temperature.
The temperature at which the pressure of the vapor in the liquid is equal to the external pressure acting on the surface of the liquid is a?
Boiling point
What Is true pressure?
True Vapor Pressure is the pressure of the vapor in equilibrium with the liquid at 100 F (it is equal to the bubble point pressure at 100 F).
Why is boiling dependent on pressure?
Boiling is dependent on pressure because the pressure affects the boiling point of a substance. When the pressure is higher, the boiling point of a substance is also higher, and when the pressure is lower, the boiling point is lower. This is because pressure affects the vapor pressure of the substance, which needs to equal the atmospheric pressure for boiling to occur.
How does pressure affect boiling point?
An increase in pressure raises the boiling point of a liquid because it takes more energy for the liquid molecules to escape the higher atmospheric pressure above them. Conversely, decreasing the pressure lowers the boiling point as it requires less energy for the molecules to overcome the reduced atmospheric pressure.
The temperature at which the vapor pressure of a liquid is equal to the exernal pressure is the?
It's called the triple point. For example when an ice-skater is skating, the thin blade creates a lot of pressure over a small area. So where the skate contacts the ice, you have solid (ice), liquid, and small amount of water vapor.
What happens at a liquid's boiling point?
Boiling. A liquid boils at a temperature at which its vapor pressure is equal to the pressure of the gas above it.
What term defines the temperature at which the vapor pressure of the liquid equals the atmospheric pressure?
The temperature at which the vapor pressure of the liquid equals the atmospheric pressure is called THE BOILING POINT.
The pressure above a liquid in a sealed container is?
equal to the sum of the atmospheric pressure and the pressure due to the weight of the liquid above the point of interest.
What is crude oil true vapor pressure?
True Vapor Pressure is the pressure of the vapor in equilibrium with the liquid at 100 F (it is equal to the bubble point pressure at 100 F)
