And how to know if you need one! While it gets lost easily in the noise of the WIC, the truth is that the wedding is the ceremony, and the reception is the party that happens after the wedding. In a similar way, the rehearsal dinner has become a big deal in the American Wedding Machine, and the rehearsal itself is often an afterthought.
Residual volume (RV) is a lung volume representing the amount of air left in the lungs after a forced exhalation; this volume cannot be measured, only calculated.
Due to the pressure gradient between the atmosphere and thoracic cavity, air moves into lungs via trachea. When the air pressure equalizes, the inhalation stops. Exhalation. Exhalation is the process of moving out of air from the lung to the outer atmosphere during ventilation.