Eötvös experiment

[uht-vuhsh, et-; Hungarian œt-vœsh] /ˈʌt vʌʃ, ˈɛt-; Hungarian ˈœt vœʃ/
noun, Physics.
1.
an experiment to confirm that all materials respond equally to gravity and that gravitational mass and inertial mass are equivalent.
Origin
named after Roland Eötvös (1848-1919), Hungarian physicist, who first performed the experiment