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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 [1][2]. 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,[3] 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.
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