| A | B |
|---|
| states of matter | the physical forms in which a substance can exist |
| solid | the state in which matter has a definite shape and volume |
| crystalline solid | a solid that has a very orderly, three-dimensional arrangement of atoms or molecules |
| amorphous solid | solids composed of atoms or molecules that have no particular order |
| liquid | state in which matter takes the shape of its container and has a definite volume |
| surface tension | the force acting on particles at the surface of a liquid that causes the liquid to form spherical drops |
| viscosity | a liquid's resistance to flow |
| gas | state in which matter changes in both shape and volume |
| pressure | the amount of force exerted on a given area |
| Boyle's law | law that states that the volume of a gas increases as its pressure decreases |
| Charles's law | law that states that the volume of a gas increases as its temperature increases |
| plasma | the state of matter that does not have a definite shape or volume and whose particles have broken apart |
| change of state | the conversion of a substance from one physical form to another |
| melting | the change of state from a solid to a liquid |
| melting point | the temperature at which the substance changes from a solid to a liquid |
| freezing | the change of state from a liquid to a solid |
| freezing point | the temperature at which a liquid changes to a solid |
| endothermic change | change where energy is absorbed |
| exothermic change | change where enery is removed or taken out |
| vaporization | the change of state from a liquid to a gas |
| boiling | vaporization that occurs throughout a liquid |
| evaporation | vaporization that occurs at the surface of a liquid |
| condensation | the change of state from a gas to a liquid |
| sublimation | the change of state from a solid directly to a gas |
