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.
The parietal pleura is a membrane that lines the cavity in the chest that contains the lungs. Another membrane, called the visceral pleura, closely covers the lung surfaces. The narrow gap between the parietal and the visceral pleura is known as the pleural cavity or space.Within this space, pleural fluid forms a thin layer on the pleural membranes, preventing friction between the surfaces.arietal pleura refers to a membrane that lines the chest cavity that contains the lungs. Traumatic injuries, such as a stab wound, may cause air in the pleural space, leading to an open pneumothorax. Pneumonia may cause the pleural space to become inflamed, which may lead to a condition known as pleurisy.