Lab 2: Lung Sounds Part 2 (charles' and boyle's law)

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9 Terms

1
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What is the purpose of a spirometer

to derive a correction factor

  • graph is volume on y-axis and time on x-axis

2
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correction factor

to report correct lung volume based on the body temp. and body pressure

  • it is used to account for the difference in temperature and pressure going from ATPS conditions to BTPS conditions

  • (Tb + 273/Ta + 273) • (760 - PH2O @Ta/760 - PH2O @Tb)

3
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ATPS

Ambient Temperature and Pressure Saturated

  • the volume of gas is DEPENDENT upon the AMBIENT TEMPERATURE (given) at a barometric pressure that is saturated with water vapor (760 mmHg outer)

4
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BTPS

Body Temperature and Pressure Saturated

  • the volume of gas is DEPENDENT upon the BODY TEMPERATURE (37°C) at a barometric pressure that is saturated with water (47 mmHg in body)

5
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Temperature from C to Kelvin (K)

C° + 273

6
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Pressure measured in…

mmHg

7
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Charles’s Law

the volume of a gas maintained at constant pressure is directly proportional to the absolute temperature of the gas (constant pressure)

  • Vbtps= Vatps • (Tb + 273/Ta + 273)

8
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Boyle’s Law

the pressure of a fixed amount of gas at a constant temperature is inversely proportional to the volume of the gas

  • Vbtps= Vatps • (760 - PH2O @Ta/760 - PH2O @Tb)

9
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Ambient Temperature

  • as ambient temperature approches 37° the correction factor approches 1