science

3. The transfer of thermal energy from one object to another due to a difference in temperature
6. Process that changes a liquid to a gas at temperatures below the boiling point
7. fuel Naturally occurring organic compounds that undergo combustion reactions to provide energy
8. Phase change that occurs when a vapor or gas turns into a liquid
10. A force that opposes motion between two objects that touch
12. zero The lowest point on the Kelvin scale
13. The transfer of thermal energy without a transfer of matter
15. Any of 118 known substances that make up matter and cannot be separated into simpler substances; also called chemical element
17. The highest point of a wave above the rest position
18. A material through which energy cannot flow easily

1. A reaction that releases or gives off energy
2. A negatively charged particle located outside the nucleus of an atom
4. State of matter that has no definite shape or volume
5. An action that causes an object to accelerate; equal to the product of an object's mass and acceleration
6. The relationship between electric and magnetic fields and their interactions with each other
9. Building block of matter, the smallest particle of an element
11. A material through which heat, electricity, or sound can flow easily
13. Heat transfer that occurs by the circulation of a moving liquid or gas
14. A substance made from two or more elements chemically bonded together and that can be chemically broken down into those substances
16. The ability to move or change matter; the ability to do work