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What is Hemopneumothorax and explain in detail?
Hemopneumothorax, or haemopneumothorax, is the condition of having air in the chest cavity (pneumothorax) and blood in the chest cavity (hemothorax). A hemothorax, pneumothorax, or the combination of both can occur due to an injury to the lung or chest.

Cause
The pleural space is located anatomically between the visceral membrane, which is firmly attached to the lungs, and the parietal membrane which is firmly attached to the chest wall (a.k.a. ribcage and intercostal muscles, muscles between the ribs).  The pleural space contains pleural fluid.  This fluid holds the two membranes together by surface tension, as much as a drop of water between two sheets of glass prevents them from separating.  Because of this, when the intercostal muscles move the ribcage outward, the lungs are pulled out as well, dropping the pressure in the lungs and pulling air into the bronchi, when we breathe in