1
2																			3
																								4
	5
												6
										7						8
														9						10
														11
12
						13

Across 2. is the amount of heat per unit mass required to raise the temperature by one degree Celsius 6. a transfer of energy through matter by colliding particles;takes place because the particles are constantly moving 11. device that converts thermal energy produced by combustion into mechanical energy 12. a concave mirror that concentrates the rays of the sun; can produce high temperatures. 13. Radiant energy emitted by the sun.

Down 1. An engine that generates motive power by the burning of gasoline, oil, or other fuel with air inside the engine 3. transfer of energy by the motion of heated particles in a fluid 4. Devices that remove thermal energy from one place and transfer it to another place at a different temperature 5. is energy that comes from a source and travels through some material or through space 7. The degree or intensity of heat present in a substance or object 8. thermal energy that flows from a warmer material to a cooler material 9. A measure of the average kinetic energy of the particles in a sample of matter, expressed in terms of units or degrees designated on a standard scale. 10. A material or an object that does not easily allow heat, electricity, light, or sound to easily pass through it.