Why does copper bottom pan rock on glass top stove?

A copper bottom pan rocks on glass top stove due to the different heat expansion coefficients of copper and glass.

- Uneven heating: Copper has a higher thermal conductivity than glass, meaning that it heats up more quickly. As the copper bottom of the pan heats up, it expands more than the glass stovetop. This difference in expansion causes the pan to rock back and forth.

- Surface imperfections: Glass stovetops can have slight surface imperfections, such as bumps or divots. These imperfections can also cause the pan to rock.

Solutions:

- Use a heat diffuser: Placing a heat diffuser between the pan and the stovetop can help to distribute heat more evenly and reduce rocking.

- Choose pans with flat bottoms: Pans with flat bottoms are less likely to rock than pans with curved bottoms.

- Avoid overheating pans: Overheating pans can cause them to warp, which can also lead to rocking.