Final answer:
Compressed gases, such as oxygen, are used to help patients with damaged lungs breathe better. They are also used in anesthesia during major operations and in welding. Compressed gases are also used for fuel in barbeque grills.
Step-by-step explanation:
Compressed gases are used in many situations. In hospitals, oxygen is often used for patients who have damaged lungs to help them breathe better. If a patient is having a major operation, the anesthesia that is administered will frequently be a compressed gas. Welding requires very hot flames produced by compressed acetylene and oxygen mixtures. Many summer barbeque grills are fueled by compressed propane.