How are both stability and change seen in properties of elements?

In both natural and built systems, stability and change are an important focus of study for both scientists and engineers. Stability refers to a system that is unchanging. ... A dynamic equilibrium exists when chemical reactions or physical movements occur at rates that balance out, creating no net change in a system.

it should be p1 v1 = p2 v2

answer by yourhope:

how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

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