- energy
- metal
- science
- education
- knowledge
- illustration
- concept
- learning
- classroom
- teaching
- school
- research
- fire
- heating
- temperature
- process
- warmth
- demonstration
- physics
- experiment
- explanation
- understanding
- conduction
- visual aid
- heat source
- metal rod
- scientific study
- thermal energy
- heat transfer
- thermal conductivity
- science education
- physical science
- temperature gradient
- educational illustration
- heat energy
- thermal transfer
- conductive materials
- heat conduction