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physical sience 1
| Term | Definition |
|---|---|
| Atom | the basic particle from which all elements are made the smallest particle of an element that has the properties of that element |
| Boil | the change in state from a liqud to a gas |
| condense | the change in state from a gas to a liquid |
| Evaporate | the process by which molecules at the surface of a liquid absorb enough energy to a gas. |
| Freeze | the temperature at which a liquid freezes |
| Gas | a state of matter with no definte shape of voulme |
| inert | having little or no ability to react |
| kinetic enegry | energy that an object has due to its motion |
| liquid | a state of matter that has no defintie shape but has a defintie voulme |
| matter | anything that has mass and takes up space |
| Melt | The temp erature at which a substance changes from A solid to a liquid |
| Molecule | A neutral group of two or more atoms held together by covalent bonds |
| Particle | Smallest possible unit of matter |
| Particle motion | Ways in which atoms, ions, molecules move. |
| Phase | a physically distinctive form of matter, such as a solid, liquid, or gas. |
| Phase change | A change from one state (solid or liquid or gas) to another without a change in chemical composition |
| Pressure | The physical force exerted on a object |
| Pure substance | A substance made of only one kind of matter and having define properties |
| Solid | A state of matter that has a definite shape and volume |
| System | A group of parts that work together as a whole |
| Temperature | A measure of the average energy of motion of the particles of a substance |
| Thermal energy | The total Kinetic and potential energy of all the particles of an object |
| Vapor | Gaseous state of a substance that is a liquid or a solid at room temperature |
| Conduction | The transfer of thermal energy from one object to another |
| Convection | The transfer of thermal energy by the movement of fluid |
| Radiation | The transfer of energy by electromagnetic waves |