physics

4. a strain in the structure of a substance produced by pressure, when its layers are laterally shifted in relation to each other.
6. the process of decreasing an object's size or volume by applying force
9. firm and stable in shape; not liquid or fluid.
12. the colorless fluid part of blood, lymph, or milk, in which corpuscles or fat globules are suspended.
15. the action of becoming larger or more extensive.
16. relating to tension
18. a substance that flows freely but is of constant volume, having a consistency like that of water or oil.
19. a regular repeated three-dimensional arrangement of atoms, ions, or molecules in a metal or other crystalline solid.
21. the ability or tendency to float in water or air or some other fluid.

1. a substance that has no fixed shape and yields easily to external pressure; a gas or (especially) a liquid.
2. the process of turning from liquid into vapor.
3. relating to heat.
5. without a clearly defined shape or form.
7. the SI unit of pressure, equal to one newton per square meter (approximately 0.000145 pounds per square inch, or 9.9 × 10-6 atmospheres).
8. the state of being thick, sticky, and semifluid in consistency, due to internal friction.
10. physical substance in general, as distinct from mind and spirit; (in physics) that which occupies space and possesses rest mass, especially as distinct from energy.
11. a substance or matter in a state in which it will expand freely to fill the whole of a container, having no fixed shape (unlike a solid) and no fixed volume (unlike a liquid).
12. continuous physical force exerted on or against an object by something in contact with it.
13. the force acting on a unit area of a material, essentially measuring the intensity of force distributed across a surface
14. the conversion of a vapor or gas to a liquid.
17. a force tending to pull or stretch something to an extreme or damaging degree.
20. a piece of a homogeneous solid substance having a natural geometrically regular form with symmetrically arranged plane faces.