| Term | Definition |
|---|
| Density | is a measure of the mass of a substance per unit volume |
| Phase | Any of the forms or states, solid, liquid, gas, or plasma, in which matter can exist, depending on temperature and pressure. |
| Cohesion | Attraction between water molecules that allows water to form drops and keeps it liquid at room temperature |
| Polar molecule | Molecule with a weak charge at each end, like a magnet, in which one element pulls on shared electrons more than the other element |
| Specific heat | Amount of energy needed to raise the temperature of 1 g of a substance by 1 degree Celsius |
| Vaporization | To convert or be converted (changed) into vapor |
| Fusion | Joining two or more things into a mixture or blend |
| Transpiration | The process of giving off vapor containing water and waste products |
| Reservoir | A natural or artificial place where water is collected and stored for use |
| Evaporate | To change from a liquid or solid state into vapor |
| Condense | to reduce to another and denser form, as a gas or vapor to a liquid or solid state |
| Sublimation | the direct conversion of a solid into a gas, without passage through a liquid stage |
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