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2. a compound or substance that has been purified or prepared, especially artificially.
4. vibrations that travel through the air or another medium and can be heard when they reach a person's or animal's ear.
8. operating by or producing electricity.
9. power derived from the utilization of physical or chemical resources, especially to provide light and heat or to work machines.
11. cord, tape, or fabric, woven with strips of rubber, which returns to its original length or shape after being stretched.
13. the quality of being hot; high temperature.
14. a large number of people or objects crowded together.
15. energy which a body possesses by virtue of being in motion.
16. Mechanical energy (kinetic energy or potential energy) is the energy of either an object in motion or the energy that is stored in objects by their position.

1. relating to heat
3. the principle by which the total value of a physical quantity or parameter (such as energy, mass, linear or angular momentum) remains constant in a system which is not subject to external influence.
5. the speed of something in a given direction.
6. relating to the nucleus of an atom.
7. the energy possessed by a body by virtue of its position relative to others, stresses within itself, electric charge, and other factors.
10. relating to movement toward a center of gravity.
12. the natural agent that stimulates sight and makes things visible.