Final answer:
The statement is true; intentional opening of lines containing hazardous materials must be done with extreme caution. Such actions are necessary for laboratory safety and to prevent inhaling harmful vapors or causing fires.
Step-by-step explanation:
The question at hand deals with safety procedures related to the handling of substances that can cause injury if not managed properly, particularly in a laboratory setting. The intentional opening of a pipe, line, or duct that has been carrying flammable, corrosive or toxic material, an inert gas, or any fluid at a volume, pressure, or temperature capable of causing injury is a procedure that must be carried out with utmost care and precaution. The statement provided is indeed true, as such practices are integral in preventing accidents and ensuring the safety of individuals in the vicinity. This kind of procedure would require an in-depth understanding of the materials being handled, as well as the appropriate safety measures such as the use of fume hoods and protective gear.
Examples in a laboratory setting may include flaring of natural gas at a well-head due to voluminous gas that cannot be contained, dealing with a lab experiment where gases are being actively manipulated and could escape through a hole, and working with controlled environments where gas distribution is spontaneous upon the opening of a valve between two flasks. Maintaining safety around open flames and understanding the chemical properties that contribute to the spontaneous dispersion of gases are critical components of safely conducting such procedures.