- Copper is a kind of metal
- A metal is usually a solid at room temperature
- So, copper is a solid at room temperature

- Copper is a solid at room temperature
- Solid is a kind of state of matter
- Therefore, the state of matter of copper is solid

Hence, the state of matter of copper is solid
Question: At room temperature, what state of matter is copper?
Context: - Solid is a kind of state of matter 
- Copper is a kind of metal 
- A metal is usually a solid at room temperature