What are the two centers that must be documented and demonstrated according to the standards?

The appropriate answer highlights the significance of both gravity and pressure as fundamental forces in various scientific and engineering contexts. Gravity is a force that exerts a pull on objects, influencing their motion and stability. In terms of documentation and demonstration, understanding how gravity affects systems is crucial across many fields, such as physics, engineering, and environmental science.

Pressure, on the other hand, is a measure of force applied over an area and is pivotal in fluid dynamics, material science, and various engineering applications. Proper documentation and demonstration of pressure are essential for ensuring safety and efficacy in designs that involve fluids or gases, making it a critical focus within established standards.

The combination of these two centers reflects a broad understanding of physical principles, ensuring that systems are accurately modeled, tested, and validated to meet industry specifications. This acknowledgment of gravity and pressure informs best practices and adherence to safety standards across multiple disciplines.