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  2. Dilatometer - Wikipedia

    en.wikipedia.org/wiki/Dilatometer

    A specific example is the rate of phase changes. [2] In food science, dilatometers are used to measure the solid fat index of food oils and butter. [3] Another common application of a dilatometer is the measurement of thermal expansion. Thermal expansivity is an important engineering parameter, and is defined as:

  3. Thermal expansion - Wikipedia

    en.wikipedia.org/wiki/Thermal_expansion

    A number of materials contract on heating within certain temperature ranges; this is usually called negative thermal expansion, rather than "thermal contraction".For example, the coefficient of thermal expansion of water drops to zero as it is cooled to 3.983 °C (39.169 °F) and then becomes negative below this temperature; this means that water has a maximum density at this temperature, and ...

  4. Caloric theory - Wikipedia

    en.wikipedia.org/wiki/Caloric_theory

    Lavoisier argued that this “igneous fluid” is the cause of heat, and that its existence is necessary to explain thermal expansion and contraction. When an ordinary body—solid or fluid—is heated, that body ... occupies a larger and larger volume. If the cause of heating ceases, the body retreats ... at the same rate as it cools.

  5. Joule expansion - Wikipedia

    en.wikipedia.org/wiki/Joule_expansion

    The Joule expansion, treated as a thought experiment involving ideal gases, is a useful exercise in classical thermodynamics. It provides a convenient example for calculating changes in thermodynamic quantities, including the resulting increase in entropy of the universe ( entropy production ) that results from this inherently irreversible process.

  6. Mercury-in-glass thermometer - Wikipedia

    en.wikipedia.org/wiki/Mercury-in-glass_thermometer

    In principle, thermometers made of different material (e.g., coloured alcohol thermometers) might be expected to give different intermediate readings due to different expansion properties; in practice the substances used are chosen to have reasonably linear expansion characteristics as a function of thermodynamic temperature, and so give ...

  7. Bimetallic strip - Wikipedia

    en.wikipedia.org/wiki/Bimetallic_strip

    The metals involved in a bimetallic strip can vary in composition so long as their thermal expansion coefficients differ. The metal of lower thermal expansion coefficient is sometimes called the passive metal, while the other is called the active metal. Copper, steel, brass, iron, and nickel are commonly used metals in bimetallic strips. [6]

  8. Weathering - Wikipedia

    en.wikipedia.org/wiki/Weathering

    Physical weathering, also called mechanical weathering or disaggregation, is the class of processes that causes the disintegration of rocks without chemical change.. Physical weathering involves the breakdown of rocks into smaller fragments through processes such as expansion and contraction, mainly due to temperature

  9. Optical dilatometer - Wikipedia

    en.wikipedia.org/wiki/Optical_dilatometer

    Optical dilatometers are used for thermal analysis of various types of materials, such as incoherent materials (expansion and contraction of an incoherent granular frit, as applied, for example, on raw tiles) and polymers (behaviour above the glass transition temperature, where the surface tension starts pulling the edges and making the sample ...

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    examples of thermal expansionthermal expansion of materials
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