| Physical constant/ Publications interval | Measurement method | CoP | Comparative uncertainty according to CoPSI, εSI | Achieved experimental lowest comparative uncertainty (IACU), εexp | Ratio εexp/εSI | Relative uncertainty according to CoPSI (IARU), rSI | Achieved experimental lowest relative uncertainty, rexp | Ratio rexp/rSI | |
| Planck constant, h 2009-2017 | a | KB1 | LMТI | 0.0245 | 0.3976 [34] | 15.9 | 4.5 × 10−9 [34] | 1.3 × 10−8 [36] | 2.9 |
| XRCD2 | LMТF | 0.0145 | 0.4733 [34] | 32.6 | 1.0 × 10−9 [34] | 9.1 × 10−9 [37] | 9.1 | ||
| Boltzmann constant, kb 2009-2018 | b | AGT3 | LMТθF | 0.1331 | 0.4832 [25] | 3.6 | 2.3 × 10−7 [25] | 6.0 × 10−7 [30] | 2.6 |
| DCGT4 | LMТθI | 0.2220 | 0.5044 [25] | 2.3 | 4.3 × 10−7 [25] | 3.7 × 10−7 [38] | 0.9 | ||
| JNT5 | LMТθI | 0.2220 | no data | no data | 1.4 × 10−6 ref. [25] | 2.7 × 10−6 [39] | 1.9 | ||
| DBT6 | LMТθF | 0.1331 | no data | no data | 2.1 × 10−5 [25] | 2.4 × 10−5 [40] | 1.1 | ||
| Hubble constant, H0 2009-2019 | c | BDL7 | LMT | 0.0048 | 0.3409 ref. [35] | 710 | 2.3 × 10−4 [35] | 1.0 × 10−2 [41] | 44 |
| CMB8 | LMTθ | 0.0442 | 0.1818 [35] | 4.1 | 2.9 × 10−3 [35] | 7.0 × 10−3 [42] | 2.4 | ||
| BAO9 | LMT | 0.0048 | 0.5 ref. [35] | 104 | 1.8 × 10−4 [35] | 1.0 × 10−2 [43] | 56 | ||
| Gravitational constant, G 2000-2018 | d | Mechanical methods10 | LMT | 0.0048 | 0.4819 [24] | 100 | 1.5 × 10−6 [24] | 1.9 × 10−5 [44] | 12.7 |
| Electromechanical methods11 | LMТI | 0.0245 | 0.1930 [24] | 7.9 | 6.3 × 10−6 [24] | 1.2 × 10−5 [45] | 1.9 | ||