change - a relational difference between states; Specially between states ahead of and after some occasion; "he attributed the change for their marriage" This incessant jostling is kinetic Strength, and also the sum of it—throughout trillions and trillions of particles—is what we get in touch with thermal Strength. In https://thermal-shock-testing13456.azzablog.com/36390122/not-known-facts-about-pcb-thermal-cycling-failure-modes