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2. Vacuum - Wikipedia

   en.wikipedia.org/wiki/Vacuum

   Perfect vacuum is an ideal state of no particles at all. It cannot be achieved in a laboratory, although there may be small volumes which, for a brief moment, ...

3. Vacuum permittivity - Wikipedia

   en.wikipedia.org/wiki/Vacuum_permittivity

   Vacuum permittivity, commonly denoted ε 0 (pronounced "epsilon nought" or "epsilon zero"), is the value of the absolute dielectric permittivity of classical vacuum. It may also be referred to as the permittivity of free space, the electric constant, or the distributed capacitance of the vacuum. It is an ideal (baseline) physical constant.

4. Joule expansion - Wikipedia

   en.wikipedia.org/wiki/Joule_expansion

   For an ideal monatomic gas, the entropy as a function of the internal energy U, volume V, and number of moles n is given by the Sackur–Tetrode equation: [11] = ⁡ [() /] +. In this expression m is the particle mass and h is the Planck constant.

5. Vacuum permeability - Wikipedia

   en.wikipedia.org/wiki/Vacuum_permeability

   The vacuum magnetic permeability (variously vacuum permeability, permeability of free space, permeability of vacuum, magnetic constant) is the magnetic permeability in a classical vacuum. It is a physical constant , conventionally written as μ 0 (pronounced "mu nought" or "mu zero").

6. Mean free path - Wikipedia

   en.wikipedia.org/wiki/Mean_free_path

   Vacuum range Pressure in hPa () Pressure in mmHg () number density (Molecules / cm 3) number density (Molecules / m 3) Mean free path Ambient pressure 1013 759.8 2.7 × 10 19: 2.7 × 10 25

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   www.aol.com/lifestyle/cult-favorite-cleaning...

   It's a mildly abrasive cleaner, so it's ideal for tackling those hard-to-tackle stains on tough materials like saucepans, cook tops, sinks, uPVC, barbecues, ceramic tiles, glass, garden furniture ...