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Physical Science 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 liquid to a gas. |
condense | the change in state from gas to to a liquid. |
evaporate | the process by which molecules at the surface of a liquid absorb enough energy to change to a gas. |
freeze | the temperature at which a liquid freeze. |
gas | a state of matter with no definite shape or volume. |
inert | having little or no ability to react. |
kinetic energy | energy that an object has due to its motion. |
liquid | a state of matter that has no definite shape but has a definite volume. |
matter | anything that has mass and takes up space. |
melt | the temperature 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,or 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 an object. |
pure substance | a substance made of only one kind of matter and having definite 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. |