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.
Etymology: Gk, pleura + itis, inflammation. inflammation of the parietal pleura of the lungs. It is characterized by dyspnea and stabbing pain, leading to restriction of ordinary breathing with spasm of the chest on the affected side.A pleural friction rub may be heard on auscultation.tymology: Gk, pleura + itis, inflammation. inflammation of the parietal pleura of the lungs. It is characterized by dyspnea and stabbing pain, leading to restriction of ordinary breathing with spasm of the chest on the affected side.