Thermal Energy

3. a set of interacting parts forming a complex whole
5. tiny organisms that are made of a single cell
7. a balanced state in which a system is stable, such as when two or more samples are at the same temperature
10. water that is underground
12. energy the energy that an object has because it is moving
14. when something stays mostly the same over time
16. heater a heating unit that stores and warms water
17. the ability to make things move or change
18. to reach a conclusion using evidence and reasoning
19. a number that summarizes a set of data and that can be computed by adding all the numbers in a list and then dividing by the number of numbers in the list

1. a small part that is meant to show what the whole is like
2. to make something safe to eat or drink by heating it
4. the moment when two objects hit each other
6. when something becomes different over time
8. a group of atoms joined together in a particular way
9. to move from one object to another or one place to another
11. energy the total kinetic energy of all the molecules that make up a sample
13. anything that has mass and takes up space
15. a measure of how hot or cold something is