Corrosive chemicals can damage containers, pipes and fittings and cause leaks or loss of containment that harm property and people. Compressed and liquefied gases bring fire, explosion, toxicity, asphyxiation, oxidation and uncontrolled release of pressure, with gas leakage among the greatest hazards and cylinders holding large volumes under high pressure. Asphyxia arises from oxygen consumption in the air, accumulation of gases that displace oxygen, or inhalation of a chemical that stops the body using oxygen, and any gas including inert gases can asphyxiate at high concentration, with heavier gases collecting in pits and cellars and lighter gases in roof spaces; confined spaces have their own code. Compressed air can damage hearing and embolism can follow penetration of skin, so training and safeguards against misuse and well-maintained air receivers matter.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.