The discussion centers on the concept of bulk modulus, defined as the ratio of pressure change to the relative change in volume. Dividing the change in volume by the original volume ensures that the bulk modulus is a property independent of sample size, allowing for consistent comparisons across different materials. The example of stacking springs illustrates how compressive properties remain constant while the overall movement increases with additional springs. It highlights that the force required to compress objects varies with their size, emphasizing the importance of relative measurements. Understanding these principles is crucial for accurately assessing material behavior under compressive forces.
