Final answer:
Category 1 support gases, such as oxygen, are permitted to power medical/surgical tools and are used for respiration.
Step-by-step explanation:
Category 1 support gases, such as oxygen, are permitted to power medical/surgical tools and are used for respiration. They are not subject to greater hazards than other piped gases. These gases play a crucial role in supporting respiratory function and providing oxygen to patients with damaged lungs or during major operations. For example, oxygen is often used in hospitals to aid patients in breathing better.