In this Article. In this Article. A solitary pulmonary nodule (SPN) is a single abnormality in the lung that is smaller than 3 cm in diameter. Generally, a pulmonary nodule must grow to at least 1 cm in diameter before it can be seen on a chest X-ray.
Osmosis is the scientific process of transferring fluid between molecules. When molecules move in and out of a cell to achieve the same concentration of something, like salt, on both sides, then osmosis is happening.
Explanation: 1  Osmosis is the process in which a solvent moves from a solution of low concentration to a solution of higher concentration 2  . A gradient is followed for this movement and once the concentration of both the solutions(on either sides of the membrane) becomes equal the solvents stop flowing.