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  2. Density - Wikipedia

    en.wikipedia.org/wiki/Density

    Density ( volumetric mass density or specific mass) is a substance's mass per unit of volume. The symbol most often used for density is ρ (the lower case Greek letter rho ), although the Latin letter D can also be used. Mathematically, density is defined as mass divided by volume: [1] where ρ is the density, m is the mass, and V is the volume ...

  3. Nucleation - Wikipedia

    en.wikipedia.org/wiki/Nucleation

    Nucleation is a common mechanism which generates first-order phase transitions, and it is the start of the process of forming a new thermodynamic phase. In contrast, new phases at continuous phase transitions start to form immediately. Nucleation is often very sensitive to impurities in the system.

  4. Matter - Wikipedia

    en.wikipedia.org/wiki/Matter

    In this definition, there is a critical pressure and an associated critical density, and when nuclear matter (made of protons and neutrons) is compressed beyond this density, the protons and neutrons dissociate into quarks, yielding quark matter (probably strange matter). The narrower meaning is quark matter that is more stable than nuclear matter.

  5. Characteristic property - Wikipedia

    en.wikipedia.org/wiki/Characteristic_property

    Characteristic property. A characteristic property is a chemical or physical property that helps identify and classify substances. The characteristic properties of a substance are always the same whether the sample being observed is large or small. Thus, conversely, if the property of a substance changes as the sample size changes, that ...

  6. Gas - Wikipedia

    en.wikipedia.org/wiki/Gas

    For a static gas, the density is the same throughout the entire container. Density is therefore a scalar quantity. It can be shown by kinetic theory that the density is inversely proportional to the size of the container in which a fixed mass of gas is confined. In this case of a fixed mass, the density decreases as the volume increases.

  7. Glossary of elementary quantum mechanics - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_elementary...

    A state is a complete description of the observable properties of a physical system. Sometimes the word is used as a synonym of "wave function" or "pure state". State vector. synonymous to "wave function". Statistical ensemble.

  8. Natural density - Wikipedia

    en.wikipedia.org/wiki/Natural_density

    Natural density. In number theory, natural density, also referred to as asymptotic density or arithmetic density, is one method to measure how "large" a subset of the set of natural numbers is. It relies chiefly on the probability of encountering members of the desired subset when combing through the interval [1, n] as n grows large.

  9. Scientific law - Wikipedia

    en.wikipedia.org/wiki/Scientific_law

    Scientific law. Scientific laws or laws of science are statements, based on repeated experiments or observations, that describe or predict a range of natural phenomena. [1] The term law has diverse usage in many cases (approximate, accurate, broad, or narrow) across all fields of natural science ( physics, chemistry, astronomy, geoscience ...

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