Solve these clues to fill the grid.
- A mathematical statement that two expressions are equal
- 3 Across
- Energy that makes things warm
- 4 Across
- How fast something moves
- 6 Across
- An increase in the density of something
- 8 Across
- A shortening or tensing of a part or organ
- 11 Across
- The mechanical ___ that a body has by virtue of its motion
- 12 Across
- Measuring instrument for measuring temperature
- 14 Across
- How loud something is, or how much space it fills
- 15 Across
- The process of producing a chemical compound
- 1 Down
- That which has mass and occupies space
- 2 Down
- The transmission of heat or electricity or sound
- 5 Down
- A constant number that serves as a measure of some property or characteristic
- 7 Down
- A substance formed by chemical union of two or more elements or ingredients in definite proportion
- 8 Down
- A tiny piece of anything
- 9 Down
- A stable situation in which forces cancel one another
- 10 Down
- State of matter that fills any space, like air
- 13 Down