Would butter in a pan on the stove be phase change of sublimation?

No, butter in a pan on the stove would not be an example of sublimation. Here's why:

* Sublimation is the process where a substance transitions directly from a solid state to a gaseous state, skipping the liquid phase. Think of dry ice turning into carbon dioxide gas.

* Butter in a pan undergoes melting, which is the transition from a solid state to a liquid state.

While some of the butter might evaporate (liquid to gas) as it heats up, the primary change you're observing is melting, not sublimation.