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# What is a tidal volume? Find out the tidal volume (approximate value) for a healthy human in an hour.

Last updated date: 15th Aug 2024
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Hint: This volume is the number of air moves in and out of the lung during each respiratory cycle. For a healthy human, the tidal volume in an hour can be calculated by using the formula.

The volume of the lung that represents the normal volume of air displaced between the process of normal inhalation and exhalation is known as tidal volume.
500ml per inspiration or 7ml per kg of body mass is the approx value of tidal volume in a healthy adult human.
Tidal volume is about $6000{ \quad to }{ \quad 8000 }$ ml of air per minute
To calculate the hourly tidal volume for a healthy human following formula will be used:
Tidal volume $={ 6000\quad { to\quad { 8000 } } }$ mL per minute
Since one hour$={ 60 }$minutes
Therefore, Tidal volume in an hour $={ 6000\quad { to\quad { 8000 } } }$ mL $\times \quad { \left( 60\quad min \right) }$
$={ 3.6\quad \times { \quad { 105ml } } }$ to $4.8\quad \times \quad { 105ml }$
Therefore, the hourly tidal volume for a healthy human is approx $3.6\quad\times \quad { 105ml }$ to $4.8\quad \times\quad { 105ml }$

Note:
-The symbol used for tidal volume is${ V }_{ T }$ or TV.
-The tidal volume plays a very significant role to ensure adequate ventilation without causing trauma to the lungs during mechanical ventilation.
-Tidal volume is measured in milliliters whereas a patient's ideal body mass is estimated to be supported by the ventilation volume.