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$\bullet$ Lung volume. The total lung volume for a typical person is 6.00 L. A person fills her lungs with air at an absolute pressure of 1.00 atm. Then, holding her breath, she compresses her chest cavity, decreasing her lung volume to 5.70 L. What is the pressure of the air in her compressed lungs, assuming that the temperature of the air remains constant?

1.0526 $\mathrm{atm}$ click to see the steps

Physics 101 Mechanics

Chapter 15

Thermal Properties of Matter

Temperature and Heat

The First Law of Thermodynamics

The Second Law of Thermodynamics

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University of Sheffield

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Lectures

03:15

In physics, the second law of thermodynamics states that the total entropy of an isolated system can only increase over time. The total entropy of a system can never decrease, and the entropy of a system approaches a constant value as the temperature approaches zero.

03:25

The First Law of Thermodynamics is an expression of the principle of conservation of energy. The law states that the change in the internal energy of a closed system is equal to the amount of heat energy added to the system, minus the work done by the system on its surroundings. The total energy of a system can be subdivided and classified in various ways.

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this's Chapter 15. Problem number 10. We're given the volume of ah, of the human loan approximately as six leaders and the pressure that it generates in the chest cavity as one atmosphere. If that's the case after and the chest cavity is compressed, if the volume changes to 5.7 leaders, what could be the pressure? Assuming that the temperature is constant at all times, so we need to do is to write down the ideal gas law for the initial case and for the compressed case, right, So he wants me. One is going to be equal to the number of moles off here inside the lardons times, the gas constant times the temperature. So if you pay attention to the right hand side of this equation and Artie, this is not changing, right? So since temperatures constance always the amount of air within the chest cavity So this right hand side is constant so that it has to be equal to P Tuesday to write and and here we know that people want we want clues p to V two. And if you divide both sides by feed through, then we can get to the new pressure. So then it's going to be P want we want over B two p one is one of atmosphere and we want his six leaders and B to his 5.7 leaders. Then the new pressure is going to turn out to be 1.5 atmosphere.

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