Final answer:
In medical settings, the suction source is typically adjusted to 100 mm Hg, falling within the safe range of 80 to 120 mm Hg for adult patients.
Step-by-step explanation:
Adjust the suction source to 100 mm Hg by occluding the end of the suction tubing. This is usually the standard pressure for medical suction devices when performing procedures such as endotracheal suctioning. Adjusting to this pressure ensures that fluids are safely and effectively removed without causing damage to tissues. The typical setting for a suction device ranges between 80 to 120 mm Hg for adults, so 100 mm Hg falls well within this range and is often considered the standard for maintaining patient safety and effective operation.