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Construction and use of a Watt balance for high precision measurements of the evaporation rate of liquids
Umeå University, Faculty of Science and Technology, Department of Physics.
2017 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

In this project, we measure the evaporation rate of methanol using a Watt balance with the precision of mass measurement down to 0.1 mg. We use the velocity mode of the Watt balance to obtain the product BL that is used later to obtain the precise mass of methanol in the force mode. Using the force mode, we determine the change of the mass of methanol droplet as it evaporates, and thus obtain the evaporation rate at room temperature. We find that the evaporation rate is not constant in time and that it depends on the mass and thus surface area of the methanol droplet. The average rate of evaporation, i.e. dm/dt is approx. -1.847(7)x10-3 x m 1/s in the range of masses from 56 mg to 12 mg. The mass of methanol as the function of time is found to follow relation

m = 5.6(2)x10-5x e-1-847(7) x 10-3 x tm kg

where tm is time.

Place, publisher, year, edition, pages
2017.
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:umu:diva-142040OAI: oai:DiVA.org:umu-142040DiVA, id: diva2:1158013
Subject / course
Fysik C - Examensarbete
Available from: 2017-11-17 Created: 2017-11-17 Last updated: 2017-11-17Bibliographically approved

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