Final answer:
The minimum headroom in all parts of a stairway should not be less than 2 meters (6 feet 8 inches), which is a standard for safety and comfort in stairway design and varies by local building codes.
Step-by-step explanation:
The question relates to engineering standards and safety requirements for stairway design. The minimum headroom in all parts of a stairway, which is the vertical distance from the stair to any overhead obstruction, is a critical design element for ensuring the safety and comfort of individuals using the stairway. Regulations for minimum headroom can vary depending on local building codes, but a common standard is that the headroom should not be less than 2 meters (6 feet 8 inches). This measurement ensures that most individuals can use the stairs without the risk of hitting their head.
When considering the examples provided, such as the step width and height for a jogger, or the calculation of doorway height for aircraft entrance, or the extreme and inhumane conditions described for slave transportation, these inform us about the importance of sufficient space for human movement and the consequences of not adhering to safety standards.