Across
- 5. temperature at which a substance changes from solid state to liquid state
- 6. number that indicates the ability of an insulating material to stop or limit transfer of heat energy
- 8. an old scientific theory that heat consists of a fluid called caloric that flows from hotter bodies to colder bodies
- 11. power a form of energy that harnesses the power of water in motion—such as water flowing through a dam—to generate electricity
- 12. a measurement of the average kinetic energy of the particles in a substance
- 13. material that does not allow heat energy or electricity to flow easily
- 14. thermal energy remaining deep inside Earth
- 16. unit for measuring energy
- 17. flow of energy in the form of invisible waves
- 18. flow of heat energy that involves moving liquid or gas particles
- 20. can be maintained or continued; capable of being used indefinitely, often referring to the use of resources
Down
- 1. non-renewable heat resources that were formed from the remains of plants and animals that lived on Earth millions of years ago. For ex., coal, oil, and natural gas
- 2. material that allows heat energy or electricity to flow easily
- 3. decrease in volume; occurs when heat energy is removed
- 4. flow of energy between substances that are in contact
- 6. liquid that evaporates at a very low temperature; used in a refrigerator
- 7. a natural resource which will replenish to replace the portion depleted by usage and consumption, either through natural reproduction or other recurring processes in a finite amount of time in a human time scale
- 9. energy energy of movement; particles that make up matter have this type of energy
- 10. system of transferring thermal energy from a single source through a network of pipes, ducts, and vents
- 11. energy that flows from matter at a higher temperature to matter at a lower temperature
- 15. change of state from gas to liquid by removing heat energy
- 19. amount of matter in an object (usually measured in grams and kilograms)