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Airway Resistance Formula

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Airway Resistance is the change in transpulmonary pressure needed to produce a unit flow of gas through the airways of the lung. Check FAQs

R AW = \frac{P atm - P A}{v̇}

R_AW - Airway Resistance?P_atm - Atmospheric Pressure?P_A - Alveolar Pressure?v̇ - Volumetric Airflow?

Airway Resistance Example

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Here is how the Airway Resistance equation looks like with Values.

Here is how the Airway Resistance equation looks like with Units.

Here is how the Airway Resistance equation looks like.

1E+10 = \frac{101325 - 10}{10}

1E+10 = \frac{101325Pa - 10cmAq}{10cm³/s}

1E+10 = \frac{101325 - 10}{10}

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Airway Resistance Solution

Follow our step by step solution on how to calculate Airway Resistance?

FIRST Step Consider the formula

R AW = \frac{P atm - P A}{v̇}

Next Step Substitute values of Variables

∴

R AW = \frac{101325Pa - 10cmAq}{10cm³/s}

Next Step Convert Units

∴

R AW = \frac{101325Pa - 980.665Pa}{1E-5m³/s}

Next Step Prepare to Evaluate

∴

R AW = \frac{101325 - 980.665}{1E-5}

Next Step Evaluate

∴

R AW = 10034433500

LAST Step Rounding Answer

∴

R AW = 1E+10

Airway Resistance Formula Elements

Variables

Airway Resistance

Airway Resistance is the change in transpulmonary pressure needed to produce a unit flow of gas through the airways of the lung.

Symbol: R_AW

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Airway Resistance

Atmospheric Pressure

Atmospheric pressure, also known as barometric pressure, is the pressure within the atmosphere of Earth.

Symbol: P_atm

Measurement: PressureUnit: Pa

Note: Value can be positive or negative.

Formulas to find Atmospheric Pressure

Alveolar Pressure

Alveolar Pressure is the pressure of air inside the lung alveoli.

Symbol: P_A

Measurement: PressureUnit: cmAq

Note: Value should be greater than 0.

Formulas to find Alveolar Pressure

Volumetric Airflow

Volumetric Airflow is the volumetric flow rate (also known as volume flow rate, rate of fluid flow, or volume velocity) is the volume of fluid which passes per unit time.

Symbol: v̇

Measurement: Volumetric Flow RateUnit: cm³/s

Note: Value should be greater than 0.

Formulas to find Volumetric Airflow

Other formulas in Lung Physiology category

Go Airway Conductance

G AW = \frac{1}{R AW}

Go Inspiratory capacity of Lung

IC = TV + IRV

Go Vital Capacity of Lung

VC = TV + IRV + ERV

Go Total Lung Capacity

TLC = IRV + TV + ERV + RV

How to Evaluate Airway Resistance?

Airway Resistance evaluator uses Airway Resistance = (Atmospheric Pressure-Alveolar Pressure)/Volumetric Airflow to evaluate the Airway Resistance, The Airway Resistance formula is defined as the resistance of the respiratory tract to airflow during inhalation and exhalation. Airway resistance can be measured using plethysmography. Airway Resistance is denoted by R_AW symbol.

How to evaluate Airway Resistance using this online evaluator? To use this online evaluator for Airway Resistance, enter Atmospheric Pressure (P_atm), Alveolar Pressure (P_A) & Volumetric Airflow (v̇) and hit the calculate button.

FAQs on Airway Resistance

What is the formula to find Airway Resistance?

The formula of Airway Resistance is expressed as Airway Resistance = (Atmospheric Pressure-Alveolar Pressure)/Volumetric Airflow. Here is an example- 1E+10 = (101325-980.665)/1E-05.

How to calculate Airway Resistance?

With Atmospheric Pressure (P_atm), Alveolar Pressure (P_A) & Volumetric Airflow (v̇) we can find Airway Resistance using the formula - Airway Resistance = (Atmospheric Pressure-Alveolar Pressure)/Volumetric Airflow.

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Airway Resistance Formula

Airway Resistance Example

Airway Resistance Solution

Airway Resistance Formula Elements

Other formulas in Lung Physiology category

How to Evaluate Airway Resistance?

FAQs on Airway Resistance

Variable Name