Thermal Energy

1. - Energy of motion.
5. - This occurs when matter is heated, causing particles to gain energy and spread out.
8. - Unit used for temperature in everyday life (in the US) (°F).
10. - The total kinetic energy of the particles in a substance (speed AND quantity of particles).
11. - A material that is good at spreading heat, like metal.
14. - This occurs when matter is cooled, causing particles to lose energy and come closer together.
16. - Refers to gases and liquids, NOT solids.
18. - Type of heat transfer where warmer, less dense particles rise; and cooler, denser particles sink in an ongoing cycle; it occurs only in fluids (gases and liquids).
19. - Unit used for temperature in science (°C).
20. - A material that traps heat and keeps it from spreading, like wood or Styrofoam.

2. - A tool used to measure temperature; it works by a liquid (mercury or ethanol[alcohol]) expanding or contracting in a thin glass tube.
3. - Type of heat transfer where particles spread heat to each other by direct contact; it requires at least one solid material.
4. - A measurement of how much space an object or substance takes up.
6. - Type of heat transfer that involves electromagnetic waves moving through a space.
7. - Toxic material that used to be found inside glass thermometers.
9. - A measurement of the average kinetic energy in a substance or object (speed of particles); it is measured with a thermometer.
12. - Property of matter that refers to how much matter ("stuff") is in a particular "space" (volume).
13. - Anything that has mass or takes up space.
15. - Heat energy.
17. - Heat will transfer from a warmer object to a cooler object until they reach an _____________ temperature.