Final answer:
The correct oxygen concentration to use when giving compressions is 100% oxygen, which displaces carbon monoxide from hemoglobin. Carbon dioxide would not be effective. In diving and medical scenarios, oxygen percentage and partial pressure are adjusted according to specific conditions.
Step-by-step explanation:
The correct oxygen concentration to use when giving compressions, especially in cases such as carbon monoxide poisoning, is 100% oxygen. Administering 100% oxygen is crucial because it has a much higher affinity for hemoglobin than carbon monoxide, which allows it to effectively displace carbon monoxide from hemoglobin, restoring the blood's oxygen-carrying capacity. Using carbon dioxide wouldn't work as it does not aid in delivering oxygen to the tissues and would not displace carbon monoxide bound to hemoglobin.
In deep diving or certain medical scenarios, maintaining the right oxygen percentage and partial pressure is essential to ensure safety and proper physiological function. For example, divers use special gas mixtures to maintain the same partial pressure of oxygen at depth as at sea level, adjusting the gas mixture accordingly to compensate for the increased ambient pressure underwater. Similar principles apply when dealing with medical oxygen cylinders and their use at different atmospheric pressures or temperatures.