Basic Concepts
In a nutshell: Thermal energy and heat explain how energy moves and changes temperature in matter.
## The Nature of Heat
Thermal energy is the energy that comes from the motion of particles in a substance. Heat is the transfer of this energy from one body to another due to a temperature difference.
### Methods of Heat Transfer
- **Conduction**: Direct contact (like a spoon heating up in a hot drink)
- **Convection**: Fluid movement (like warm air rising)
- **Radiation**: Transfer through electromagnetic waves (like sunlight)
### Temperature vs. Heat
Temperature measures how hot or cold something is, while heat is energy in transit. They are related but not the same!
### Real-World Relevance
Understanding heat transfer helps explain everything from how a refrigerator works to why you feel cool under a fan.
Examples
- A metal spoon feels hot after sitting in a cup of tea.
- The attic is warmer than the basement thanks to convection.