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1.0072764665789, "value_string": "1.007 276 466 5789", "uncertainty": 8.3e-12, "uncertainty_string": "0.000 000 000 0083", "unit": null, "exact": false, "category": "atomic-and-nuclear", "source": "CODATA 2022 (NIST)", "source_url": "https://physics.nist.gov/cuu/Constants/" }, { "slug": "proton-rms-charge-radius", "name": "proton rms charge radius", "value": 8.4075e-16, "value_string": "8.4075 e-16", "uncertainty": 6.4e-19, "uncertainty_string": "0.0064 e-16", "unit": "m", "exact": false, "category": "atomic-and-nuclear", "source": "CODATA 2022 (NIST)", "source_url": "https://physics.nist.gov/cuu/Constants/" }, { "slug": "proton-tau-mass-ratio", "name": "proton-tau mass ratio", "value": 0.528051, "value_string": "0.528 051", "uncertainty": 0.000036, "uncertainty_string": "0.000 036", "unit": null, "exact": false, "category": "atomic-and-nuclear", "source": "CODATA 2022 (NIST)", "source_url": "https://physics.nist.gov/cuu/Constants/" }, { "slug": "quantum-of-circulation", "name": 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"uncertainty_string": "exact", "unit": "J s", "exact": true, "category": "universal", "source": "CODATA 2022 (NIST)", "source_url": "https://physics.nist.gov/cuu/Constants/" }, { "slug": "reduced-planck-constant-in-ev-s", "name": "reduced Planck constant in eV s", "value": 6.582119569e-16, "value_string": "6.582 119 569... e-16", "uncertainty": null, "uncertainty_string": "exact", "unit": "eV s", "exact": true, "category": "universal", "source": "CODATA 2022 (NIST)", "source_url": "https://physics.nist.gov/cuu/Constants/" }, { "slug": "reduced-planck-constant-times-c-in-mev-fm", "name": "reduced Planck constant times c in MeV fm", "value": 197.3269804, "value_string": "197.326 980 4...", "uncertainty": null, "uncertainty_string": "exact", "unit": "MeV fm", "exact": true, "category": "universal", "source": "CODATA 2022 (NIST)", "source_url": "https://physics.nist.gov/cuu/Constants/" }, { "slug": "reduced-proton-compton-wavelength", "name": "reduced proton Compton wavelength", "value": 2.10308910051e-16, "value_string": "2.103 089 100 51 e-16", "uncertainty": 6.6e-26, "uncertainty_string": "0.000 000 000 66 e-16", "unit": "m", "exact": false, "category": "atomic-and-nuclear", "source": "CODATA 2022 (NIST)", "source_url": "https://physics.nist.gov/cuu/Constants/" }, { "slug": "reduced-tau-compton-wavelength", "name": "reduced tau Compton wavelength", "value": 1.110538e-16, "value_string": "1.110 538 e-16", "uncertainty": 7.5e-21, "uncertainty_string": "0.000 075 e-16", "unit": "m", "exact": false, "category": "atomic-and-nuclear", "source": "CODATA 2022 (NIST)", "source_url": "https://physics.nist.gov/cuu/Constants/" }, { "slug": "rydberg-constant", "name": "Rydberg constant", "value": 10973731.568157, "value_string": "10 973 731.568 157", "uncertainty": 0.000012, "uncertainty_string": "0.000 012", "unit": "m^-1", "exact": false, "category": "atomic-and-nuclear", "source": "CODATA 2022 (NIST)", "source_url": "https://physics.nist.gov/cuu/Constants/" }, { "slug": 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false, "category": "atomic-and-nuclear", "source": "CODATA 2022 (NIST)", "source_url": "https://physics.nist.gov/cuu/Constants/" }, { "slug": "sackur-tetrode-constant-1-k-100-kpa", "name": "Sackur-Tetrode constant (1 K, 100 kPa)", "value": -1.15170753496, "value_string": "-1.151 707 534 96", "uncertainty": 4.7e-10, "uncertainty_string": "0.000 000 000 47", "unit": null, "exact": false, "category": "physico-chemical", "source": "CODATA 2022 (NIST)", "source_url": "https://physics.nist.gov/cuu/Constants/" }, { "slug": "sackur-tetrode-constant-1-k-101325-kpa", "name": "Sackur-Tetrode constant (1 K, 101.325 kPa)", "value": -1.16487052149, "value_string": "-1.164 870 521 49", "uncertainty": 4.7e-10, "uncertainty_string": "0.000 000 000 47", "unit": null, "exact": false, "category": "physico-chemical", "source": "CODATA 2022 (NIST)", "source_url": "https://physics.nist.gov/cuu/Constants/" }, { "slug": "second-radiation-constant", "name": "second radiation constant", "value": 0.01438776877, "value_string": "1.438 776 877... e-2", "uncertainty": null, "uncertainty_string": "exact", "unit": "m K", "exact": true, "category": "physico-chemical", "source": "CODATA 2022 (NIST)", "source_url": "https://physics.nist.gov/cuu/Constants/" }, { "slug": "shielded-helion-gyromag-ratio", "name": "shielded helion gyromag. ratio", "value": 203789460.78, "value_string": "2.037 894 6078 e8", "uncertainty": 0.18, "uncertainty_string": "0.000 000 0018 e8", "unit": "s^-1 T^-1", "exact": false, "category": "atomic-and-nuclear", "source": "CODATA 2022 (NIST)", "source_url": "https://physics.nist.gov/cuu/Constants/" }, { "slug": "shielded-helion-gyromag-ratio-in-mhz-t", "name": "shielded helion gyromag. ratio in MHz/T", "value": 32.434100033, "value_string": "32.434 100 033", "uncertainty": 2.8e-8, "uncertainty_string": "0.000 000 028", "unit": "MHz T^-1", "exact": false, "category": "atomic-and-nuclear", "source": "CODATA 2022 (NIST)", "source_url": "https://physics.nist.gov/cuu/Constants/" }, { 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"shielded-proton-gyromag-ratio", "name": "shielded proton gyromag. ratio", "value": 267515319.4, "value_string": "2.675 153 194 e8", "uncertainty": 1.1, "uncertainty_string": "0.000 000 011 e8", "unit": "s^-1 T^-1", "exact": false, "category": "atomic-and-nuclear", "source": "CODATA 2022 (NIST)", "source_url": "https://physics.nist.gov/cuu/Constants/" }, { "slug": "shielded-proton-gyromag-ratio-in-mhz-t", "name": "shielded proton gyromag. ratio in MHz/T", "value": 42.57638543, "value_string": "42.576 385 43", "uncertainty": 1.7e-7, "uncertainty_string": "0.000 000 17", "unit": "MHz T^-1", "exact": false, "category": "atomic-and-nuclear", "source": "CODATA 2022 (NIST)", "source_url": "https://physics.nist.gov/cuu/Constants/" }, { "slug": "shielded-proton-mag-mom", "name": "shielded proton mag. mom.", "value": 1.410570583e-26, "value_string": "1.410 570 5830 e-26", "uncertainty": 5.8e-35, "uncertainty_string": "0.000 000 0058 e-26", "unit": "J T^-1", "exact": false, "category": 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{ "slug": "tau-neutron-mass-ratio", "name": "tau-neutron mass ratio", "value": 1.89115, "value_string": "1.891 15", "uncertainty": 0.00013, "uncertainty_string": "0.000 13", "unit": null, "exact": false, "category": "atomic-and-nuclear", "source": "CODATA 2022 (NIST)", "source_url": "https://physics.nist.gov/cuu/Constants/" }, { "slug": "tau-proton-mass-ratio", "name": "tau-proton mass ratio", "value": 1.89376, "value_string": "1.893 76", "uncertainty": 0.00013, "uncertainty_string": "0.000 13", "unit": null, "exact": false, "category": "atomic-and-nuclear", "source": "CODATA 2022 (NIST)", "source_url": "https://physics.nist.gov/cuu/Constants/" }, { "slug": "thomson-cross-section", "name": "Thomson cross section", "value": 6.6524587051e-29, "value_string": "6.652 458 7051 e-29", "uncertainty": 6.2e-38, "uncertainty_string": "0.000 000 0062 e-29", "unit": "m^2", "exact": false, "category": "atomic-and-nuclear", "source": "CODATA 2022 (NIST)", "source_url": 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"value_string": "3.015 500 715 97", "uncertainty": 1e-10, "uncertainty_string": "0.000 000 000 10", "unit": "u", "exact": false, "category": "atomic-and-nuclear", "source": "CODATA 2022 (NIST)", "source_url": "https://physics.nist.gov/cuu/Constants/" }, { "slug": "triton-molar-mass", "name": "triton molar mass", "value": 0.00301550071913, "value_string": "3.015 500 719 13 e-3", "uncertainty": 9.4e-13, "uncertainty_string": "0.000 000 000 94 e-3", "unit": "kg mol^-1", "exact": false, "category": "physico-chemical", "source": "CODATA 2022 (NIST)", "source_url": "https://physics.nist.gov/cuu/Constants/" }, { "slug": "triton-proton-mass-ratio", "name": "triton-proton mass ratio", "value": 2.99371703403, "value_string": "2.993 717 034 03", "uncertainty": 1e-10, "uncertainty_string": "0.000 000 000 10", "unit": null, "exact": false, "category": "atomic-and-nuclear", "source": "CODATA 2022 (NIST)", "source_url": "https://physics.nist.gov/cuu/Constants/" }, { "slug": "triton-relative-atomic-mass", "name": "triton relative atomic mass", "value": 3.01550071597, "value_string": "3.015 500 715 97", "uncertainty": 1e-10, "uncertainty_string": "0.000 000 000 10", "unit": null, "exact": false, "category": "atomic-and-nuclear", "source": "CODATA 2022 (NIST)", "source_url": "https://physics.nist.gov/cuu/Constants/" }, { "slug": "triton-to-proton-mag-mom-ratio", "name": "triton to proton mag. mom. ratio", "value": 1.0666399189, "value_string": "1.066 639 9189", "uncertainty": 2.1e-9, "uncertainty_string": "0.000 000 0021", "unit": null, "exact": false, "category": "electromagnetic", "source": "CODATA 2022 (NIST)", "source_url": "https://physics.nist.gov/cuu/Constants/" }, { "slug": "unified-atomic-mass-unit", "name": "unified atomic mass unit", "value": 1.66053906892e-27, "value_string": "1.660 539 068 92 e-27", "uncertainty": 5.2e-37, "uncertainty_string": "0.000 000 000 52 e-27", "unit": "kg", "exact": false, "category": "physico-chemical", "source": "CODATA 2022 (NIST)", "source_url": "https://physics.nist.gov/cuu/Constants/" }, { "slug": "vacuum-electric-permittivity", "name": "vacuum electric permittivity", "value": 8.8541878188e-12, "value_string": "8.854 187 8188 e-12", "uncertainty": 1.4e-21, "uncertainty_string": "0.000 000 0014 e-12", "unit": "F m^-1", "exact": false, "category": "universal", "source": "CODATA 2022 (NIST)", "source_url": "https://physics.nist.gov/cuu/Constants/" }, { "slug": "vacuum-mag-permeability", "name": "vacuum mag. permeability", "value": 0.00000125663706127, "value_string": "1.256 637 061 27 e-6", "uncertainty": 2e-16, "uncertainty_string": "0.000 000 000 20 e-6", "unit": "N A^-2", "exact": false, "category": "universal", "source": "CODATA 2022 (NIST)", "source_url": "https://physics.nist.gov/cuu/Constants/" }, { "slug": "von-klitzing-constant", "name": "von Klitzing constant", "value": 25812.80745, "value_string": "25 812.807 45...", "uncertainty": null, "uncertainty_string": "exact", "unit": "ohm", "exact": true, "category": "electromagnetic", "source": "CODATA 2022 (NIST)", "source_url": "https://physics.nist.gov/cuu/Constants/" }, { "slug": "w-to-z-mass-ratio", "name": "W to Z mass ratio", "value": 0.88145, "value_string": "0.881 45", "uncertainty": 0.00013, "uncertainty_string": "0.000 13", "unit": null, "exact": false, "category": "atomic-and-nuclear", "source": "CODATA 2022 (NIST)", "source_url": "https://physics.nist.gov/cuu/Constants/" }, { "slug": "weak-mixing-angle", "name": "weak mixing angle", "value": 0.22305, "value_string": "0.223 05", "uncertainty": 0.00023, "uncertainty_string": "0.000 23", "unit": null, "exact": false, "category": "atomic-and-nuclear", "source": "CODATA 2022 (NIST)", "source_url": "https://physics.nist.gov/cuu/Constants/" }, { "slug": "wien-frequency-displacement-law-constant", "name": "Wien frequency displacement law constant", "value": 58789257570, "value_string": "5.878 925 757... e10", "uncertainty": null, "uncertainty_string": "exact", "unit": "Hz K^-1", "exact": true, "category": "physico-chemical", "source": "CODATA 2022 (NIST)", "source_url": "https://physics.nist.gov/cuu/Constants/" }, { "slug": "wien-wavelength-displacement-law-constant", "name": "Wien wavelength displacement law constant", "value": 0.002897771955, "value_string": "2.897 771 955... e-3", "uncertainty": null, "uncertainty_string": "exact", "unit": "m K", "exact": true, "category": "physico-chemical", "source": "CODATA 2022 (NIST)", "source_url": "https://physics.nist.gov/cuu/Constants/" } ]