The pressure is computed assuming an International standard sea-level pressure datum of 1013.25 hPa, and therefore is not necessarily the same as the aircraft's true altitude either above mean sea level or above ground level.he pressure is computed assuming an International standard sea-level pressure datum of 1013.25 hPa, and therefore is not necessarily the same as the aircraft's true altitude either above mean sea level or above ground level.
The term pleurisy (pleuritis) is inflammation or infection in the pleural space around the lungs. Pyothorax also known as empyema of the pleural cavity is the presence of pus in the pleural cavity between the layers of the pleural membrane Py/o-Pus.
Pleural: Pertaining to the pleura, the thin covering that protects the lungs. The term pl... See the entire definition of Pleural. Pleural effusion: Excess fluid between the two membranes that cover the lungs (the viscera... See the entire definition of Pleural effusion. Pneumonia: Inflammation of one or both lungs, with dense areas of lung inflammation.