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High precision measurements of the evaporation rate of liquids by the use of a Kibble balance
Umeå University, Faculty of Science and Technology, Department of Physics.
2018 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Kibble balance (previously watt balance) is an electromechanical weight measuring instrument that measures the weight of a test object very precisely by the strength of an electric current and a voltage. The aim of this experiment is to build a working Kibble balance to measure the evaporation rate of a water droplet. In this report, the theoretical basis of the Kibble Balance system including the working principles, Setup, PID controller programming and the calibration method is introduced. In the result part of the report, the coefficient of the coil BL will be given by two kinds of method (velocity mode and force mode). The coefficient given by velocity mode is 6.76(27)x102 T·m and the coefficient given by force mode is 6.77(30)x102 T·m. Both of the modes works well in this experiment. The evaporation rate of a water droplet is -0.11(1) mg/min. Unfortunately, the measurement of the alcohol droplet didn't succeed because the alcohol evaporated very fast and the PID controller was not fast enough to measure.

Place, publisher, year, edition, pages
2018.
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:umu:diva-150053OAI: oai:DiVA.org:umu-150053DiVA, id: diva2:1230815
Subject / course
Fysik C - Examensarbete
Available from: 2018-07-04 Created: 2018-07-04 Last updated: 2018-07-04Bibliographically approved

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