| Term | Definition |
|---|
| Variable | An observable (usually measurable) quantity or quality of an experiment that a scientist considers as a factor affecting the experiment's outcome. Usually considered either dependent or independent. |
| Solute | The dissolved substance in a solution. |
| Solvent | The liquid into which the solute is dissolved. |
| Isotonic | A solution in which the concentration of solutes outside the cell is equals to the concentration inside. |
| Hypertonic | A solution in which the concentration of solutes outside a cell is greater than the concentration inside. |
| Hypotonic | A solution in which the concentration of solutes outside a cell is less than the concentration inside. |
| Diffusion | The movement of a substance from an area of high concentration to low concentration. |
| Concentration Gradient | A difference in the concentration of a substance from one location to another. |
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