Final answer:
Class 1 gases are flammable.
Step-by-step explanation:
Flammability, as a chemical property, characterizes a substance's ability to undergo combustion or ignition when exposed to heat or flame. Class 1 includes gases that are flammable, highlighting their potential to support combustion. Hydrogen, methane, propane, and butane are examples of flammable gases known for their combustible nature. These substances exhibit chemical reactions involving the release of energy and heat during combustion. Understanding the flammability of gases is crucial for safety considerations, handling, and storage practices, as it enables proper precautions to prevent accidents or uncontrolled fires, ensuring the safe use and management of flammable materials in various industrial and everyday applications.