They have different dimensions. They have different boiling points. They are made up of a different type of matter. They contain a different amount of matter per unit volume.
I gave my students this multiple choice question: Two pieces of the same metal are placed on a table. The pieces of metal have the same density, mass, and texture. Which characteristic must be the ONLY difference between the two samples?

Only one answer is correct among these 4 choices:
- They have different dimensions.
- They have different boiling points.
- They are made up of a different type of matter.
- They contain a different amount of matter per unit volume.

Could you tell me which one is correct?

They have different dimensions.