|Conservation law of||Related symmetry||Explanation|
|momentum||translation symmetry in space||Executing an experiment 'here' gives the same result as executing it 'there', provided that the conditions are identical.|
|energy||translation symmetry in de tijd||Executing an experiment 'earlier' gives the same result as executing it 'later', provided that the conditions are identical.|
|electrical charge||translation symmetry along the potential-axis||Electrical voltage is a potential difference. The absolute value of the voltage cannot be measured, because in an electrical system, everything happens in the same way after adding a constant potential everywhere.|
(In an electrical circuit any point can be chosen to be connected with earth or ground, by definition the zero voltage.)
|mass||translation symmetry along the gravitational energy-axis||In a gravitational system (for example, in the planetary system) gravity energy is not defined. Only gravitational energy differences can be calculated. The planets would move identically if a constant energy is added to the gravitational energy formula.
In practice, in an infinitely distant point the gravitational energy is chosen to be zero by definition.|
|angular momentum||rotation symmetry in space|