2000 Forint Loránd Eötvös

Issued to mark the centenary of Loránd Eötvös's invention of the torsion balance, an instrument precise enough to detect subsurface gravitational anomalies and later used extensively in oil exploration — including by American petroleum companies in the 1920s who licensed the technique without always crediting its Hungarian origin. Eötvös had developed the device while serving as president of the Hungarian Academy of Sciences and simultaneously running the country's meteorological and geophysical survey programs.

The gravitational unit of measurement, the Eötvös unit, was formally adopted by the international geophysical community in his honor.