> Potassium ions need more space, pressing harder against neighbouring atoms and building up more tension that needs to be overcome for the microscopic cracks t

> Potassium ions need more space, pressing harder against neighbouring atoms and building up more tension that needs to be overcome for the microscopic cracks to get bigger. I just posted a comment in which I doubt the article's explanation of the physics behind the process: https://news.ycombinator.com/item?id=41180590 https://news.ycombinator.com/item?id=41180590