{"paper":{"title":"Measurement of the Planck constant at the National Institute of Standards and Technology from 2015 to 2017","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.class-ph"],"primary_cat":"physics.ins-det","authors_text":"A. Possolo, C.J. Williams, D.B. Newell, D. Haddad, F. Seifert, J.R. Pratt, L.S. Chao, S. Schlamminger","submitted_at":"2017-08-08T13:14:31Z","abstract_excerpt":"Researchers at the National Institute of Standards and Technology(NIST) have measured the value of the Planck constant to be $h =6.626\\,069\\,934(89)\\times 10^{-34}\\,$J$\\,$s (relative standard uncertainty $13\\times 10^{-9}$). The result is based on over 10$\\,$000 weighings of masses with nominal values ranging from 0.5$\\,$kg to 2$\\,$kg with the Kibble balance NIST-4. The uncertainty has been reduced by more than twofold relative to a previous determination because of three factors: (1) a much larger data set than previously available, allowing a more realistic, and smaller, Type A evaluation; ("},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1708.02473","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}