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Chosen thermodynamic experiments: depression of the freezing point of water with salt and supercooled water

Katja Krnc (2014) Chosen thermodynamic experiments: depression of the freezing point of water with salt and supercooled water. Diploma thesis.

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    Abstract

    The diploma thesis presents two interesting thermodynamic experiments which were executed and described by Joseph Black in 18th Century. These are: depression of the freezing point of water with salt and supercooled water. We meet water in three states of matter in nature: in the state of ice, liquid water, and water steam. Phase crossing from water to ice (and vice versa from ice to water) is done with normal air pressure with the state temperature of 0°C. If we add certain matters to water (e.g. salt) the temperature of water freezing point is lower than usual freezing point. This characteristic is beneficially used in traffic where we salt icy roads and therefore cause melting of ice at lower temperature. However, it is not necessary that water freezes at temperature 0°C and normal air pressure without additives. It can happen that clean water first lowers the temperature below the freezing point and freezes after that, after freezing then its temperature goes up to 0°C. We call this phenomenon supercooling of water. Both experiments (or phenomena) are described in the diploma thesis thoroughly. The physical background is presented. Measurements and findings, gained when executing both experiments, have been presented as well. At the end, the project about the chosen theme, which has been executed with the 9th grade primary school pupils, has been presented.

    Item Type: Thesis (Diploma thesis)
    Keywords: water, sodium chloride, phase crossing, depression of freezing point, supercooled water, salting of roads
    Number of Pages: 56
    Language of Content: Slovenian
    Mentor / Comentors:
    Mentor / ComentorsIDFunction
    red. prof. dr. Mojca ČepičMentor
    Link to COBISS: http://www.cobiss.si/scripts/cobiss?command=search&base=50126&select=(ID=10147657)
    Institution: University of Ljubljana
    Department: Faculty of Education, Faculty of Mathematics and Physics
    Item ID: 2330
    Date Deposited: 28 Aug 2014 07:14
    Last Modified: 28 Aug 2014 07:14
    URI: http://pefprints.pef.uni-lj.si/id/eprint/2330

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