Perfluorohexane is a component in which hydrogen atoms from hexane are replaced by fluorine. It is mostly used as a solvent and coolant. However, one of the coolest things about this component is that due to its molecular structure, it allows space for gas molecules to be lodged into the liquid from the atmosphere. This means that there is oxygen lodged in between its molecules in a higher concentration than the atmosphere. This phenomenom allows for animals to continue breathing and not drown!
The uses for this property are not just a novelty. The liquid is used to treat burn victims, because their lungs can be filled with this liquid and avoid problems like pulmonary edema, which is caused when the inside of the lungs have been burnt.