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  2. Mass balance - Wikipedia

    en.wikipedia.org/wiki/Mass_balance

    In physics, a mass balance, also called a material balance, is an application of conservation of mass [1] to the analysis of physical systems. By accounting for material entering and leaving a system, mass flows can be identified which might have been unknown, or difficult to measure without this technique.

  3. Material balance planning - Wikipedia

    en.wikipedia.org/wiki/Material_balance_planning

    Material balancing involves taking a survey of the available inputs and raw materials in an economy and then using a balance sheet to balance the inputs with output targets specified by industry to achieve a balance between supply and demand. This balance is used to formulate a plan for resource allocation and investment in a national economy ...

  4. Plug flow reactor model - Wikipedia

    en.wikipedia.org/wiki/Plug_flow_reactor_model

    A material balance on the differential volume of a fluid element, or plug, on species i of axial length dx between x and x + dx gives: [accumulation] = [in] - [out] + [generation] - [consumption] Accumulation is 0 under steady state; therefore, the above mass balance can be re-written as follows: 1.

  5. Loss on ignition - Wikipedia

    en.wikipedia.org/wiki/Loss_on_ignition

    Weigh the empty crucible that the sample is to be placed in and record its weight in a lab book. Place the sample in the empty crucible and weigh the crucible again with the sample in it. The new weight minus the empty crucible weight is the sample's wet weight. Place the sample in the drying oven or blast furnace as required.

  6. Economic planning - Wikipedia

    en.wikipedia.org/wiki/Economic_planning

    Material balance planning was the type of economic planning employed by Soviet-type economies. This system emerged in a haphazard manner during the collectivization drive under Joseph Stalin and emphasized rapid growth and industrialization. Eventually, this method became an established part of the Soviet conception of socialism in the post-war ...

  7. Flux balance analysis - Wikipedia

    en.wikipedia.org/wiki/Flux_balance_analysis

    The optimal solution to the flux-balance problem is rarely unique with many possible, and equally optimal, solutions existing. Flux variability analysis (FVA), built into some analysis software, returns the boundaries for the fluxes through each reaction that can, paired with the right combination of other fluxes, estimate the optimal solution.

  8. Stefan problem - Wikipedia

    en.wikipedia.org/wiki/Stefan_problem

    This is an energy balance which defines the position of the moving interface. Note that this evolving boundary is an unknown (hyper-)surface; hence, Stefan problems are examples of free boundary problems. Analogous problems occur, for example, in the study of porous media flow, mathematical finance and crystal growth from monomer solutions. [1]

  9. Moisture analysis - Wikipedia

    en.wikipedia.org/wiki/Moisture_analysis

    In this technique, a sample of material is weighed, heated in an oven for an appropriate period, cooled in the dry atmosphere of a desiccator, and then reweighed. If the volatile content of the solid is primarily water, the loss on drying technique gives a good measure of moisture content. [ 5 ]