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| the branch of physics that deals with sound and sound waves |
| the property of matter by which it retains its state of rest or its velocity along a straight line so long as it is not acted upon by an external force |
| subshell (sŭb'shěl') Pronunciation Key
One or more orbitals in the electron shell of an atom with the same energy level. Subshells have different shapes and are distinguished by their magnetic quantum number. See more at orbital, quantum number. |