How is carbon dioxide stored?

Carbon dioxide is stored in a compressed cylinder, where it can exist either as a liquid or a gas depending on the temperature and pressure conditions. In a pressurized cylinder, carbon dioxide can be liquefied when pressure is applied, and it will remain in this liquid state until the pressure is released. Upon depressurization, it will evaporate and can exist as a gas at normal atmospheric conditions.

This dual state of carbon dioxide storage is significant for various applications, including medical, commercial, and industrial uses. The ability to store carbon dioxide as both liquid and gas allows for efficient transportation and use in various medical gas applications, including respiratory therapy and as a preservative in certain medical environments. Understanding the behavior of gases under pressure is crucial in the handling and administration of medical gases to ensure safety and efficacy in treatment.

The other options do not accurately reflect the properties and storage methods of carbon dioxide. For example, stating that carbon dioxide is only stored as a gas at room temperature overlooks the fact that it can be compressed into a liquid form. Similarly, the idea that it can only be stored in thermoses or dissolved in oxygen tanks misrepresents its standard storage methods in compressed gas cylinders.