Why a Chest Tube is Placed. A chest tube is placed for a variety of reasons. One reason, as you mentioned, is to help the lung re-inflate when someone has a collapsed lung, also known as a pneumothorax. In that circumstance, a chest tube is inserted along the side of the ribs to allow the lung to reinflate.
A. Osmosis is the passive movement of water from an area high in water concentration, across a semi-permeable membrane, to an area low in water concentration.
Diffusion is the movement of a substance from a higher concentration to a lower concentration. Osmosis is the diffusion of water across a semi-permeable membrane. So the dâ¦ifference is that diffusion involves movement of any particles (e.g. solid, liquid, gas) while osmosis can only occur with water.