A gas is the volatile state of a chemical substance, with, at normal temperature and pressure, no definite shape or volume of its own. Summary
Compressed gases are hazardous because of the energy stored within the receptacle; if the receptacle breaks released fragments can be projected with considerable force. Refrigerated gases are hazardous because of the extreme low temperatures of the container and/or the substance which can cause severe tissue damage. Risks
Gases are classified into categories that identify the danger they present. In Practice
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