Editing Cavendish experiment (section)

===Definitions of terms===

{| class="wikitable"
!Symbol ||Unit ||Definition
|-
|<math>\theta</math>||[[radian]]s||Deflection of torsion balance beam from its rest position
|-
|''F''||[[newton (unit)|N]]||Gravitational force between masses ''M'' and ''m''
|-
|''G''||m{{sup|3}} kg{{sup|−1}} s{{sup|−2}}||Gravitational constant
|-
|''m''||kg||Mass of small lead ball
|-
|''M''||kg||Mass of large lead ball
|-
|''r''||m||Distance between centers of large and small balls when balance is deflected
|-
|''L''||m||Length of torsion balance beam between centers of small balls
|-
|<math>\kappa</math>||N m rad{{sup|−1}}||Torsion coefficient of suspending wire
|-
|{{math|''I''}}||kg m{{sup|2}}||Moment of inertia of torsion balance beam
|-
|''T''||s||Period of oscillation of torsion balance
|-
|''g''||m s{{sup|−2}}||Acceleration of gravity at the surface of the Earth
|-
|''M''{{sub|earth}}||kg||Mass of the Earth
|-
|''R''{{sub|earth}}||m||Radius of the Earth
|-
|<math>\rho</math>{{sub|earth}}||kg m{{sup|−3}}||Density of the Earth
|}