Item AM052004: When an iron frying pan heats up, the distance between the iron atoms increases, so the pan gets a tiny bit larger.

A cook places an iron frying pan on the stove.  What happens as the iron pan heats up?

  1. The number of iron atoms increases, so the pan gets a tiny bit larger.
  2. The number of iron atoms does not change, so the pan remains the same.
  3. The distance between the iron atoms increases, so the pan gets a tiny bit larger.
  4. The distance between the iron atoms does not change, so the pan remains the same.