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Experimental determination
In 2017, the most accurate measures of the Boltzmann constant were obtained by determining the speed of sound of a monatomic gas in a triaxial ellipsoid chamber using microwave and acoustic resonances. This decade-long effort was undertaken by several laboratories with different techniques as one of the founding stones for the 2018 redefinition of the International System of Units. Based on these measurements, the CODATA recommended 1.380 649 × 10−23 J⋅K−1 to be the final fixed value of the Boltzmann constant to be used for the International System of Units.