%0 Generic %1 chao2014balance %A Chao, L. S. %A Schlamminger, S. %A Newell, D. B. %A Pratt, J. R. %A Sineriz, G. %A Seifert, F. %A Cao, A. %A Haddad, D. %A Zhang, X. %D 2014 %K arxiv ed-ph %T A LEGO Watt Balance: An apparatus to demonstrate the definition of mass based on the new SI %U http://arxiv.org/abs/1412.1699 %X A global effort to redefine our International System of Units (SI) is underway and the change to the new system is expected to occur in 2018. Within the newly redefined SI, the present base units will still exist but be derived from fixed numerical values of seven reference constants. More specifically, the unit of mass, the kilogram, will be realized through a fixed value of the Planck constant $h$. For instance, a watt balance can be used to realize the kilogram unit of mass within a few parts in $10^8$. Such a balance has been designed and constructed at the National Institute of Standards and Technology. For educational outreach and to demonstrate the principle, we have constructed a LEGO tabletop watt balance capable of measuring a gram size mass to 1 % relative uncertainty. This article presents the design, construction, and performance of the LEGO watt balance and its ability to determine $h$

@misc{chao2014balance, abstract = {A global effort to redefine our International System of Units (SI) is underway and the change to the new system is expected to occur in 2018. Within the newly redefined SI, the present base units will still exist but be derived from fixed numerical values of seven reference constants. More specifically, the unit of mass, the kilogram, will be realized through a fixed value of the Planck constant $h$. For instance, a watt balance can be used to realize the kilogram unit of mass within a few parts in $10^8$. Such a balance has been designed and constructed at the National Institute of Standards and Technology. For educational outreach and to demonstrate the principle, we have constructed a LEGO tabletop watt balance capable of measuring a gram size mass to 1 % relative uncertainty. This article presents the design, construction, and performance of the LEGO watt balance and its ability to determine $h$}, added-at = {2014-12-14T18:44:30.000+0100}, author = {Chao, L. S. and Schlamminger, S. and Newell, D. B. and Pratt, J. R. and Sineriz, G. and Seifert, F. and Cao, A. and Haddad, D. and Zhang, X.}, biburl = {https://www.bibsonomy.org/bibtex/24d6555d37f17223a0472ae3137390fb6/vch}, description = {A LEGO Watt Balance: An apparatus to demonstrate the definition of mass based on the new SI}, interhash = {78b0f1ea9f217f97c1d5dd5aa084e922}, intrahash = {4d6555d37f17223a0472ae3137390fb6}, keywords = {arxiv ed-ph}, note = {cite arxiv:1412.1699Comment: 11 pages, 6 figures. Also included is a partlist to build your own LEGO watt balance. The article has been submitted to American Journal of Physics. After it is published, it will be found at http://scitation.aip.org/content/aapt/journal/ajp}, timestamp = {2014-12-14T18:44:30.000+0100}, title = {A LEGO Watt Balance: An apparatus to demonstrate the definition of mass based on the new SI}, url = {http://arxiv.org/abs/1412.1699}, year = 2014 }