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  2. Relative density - Wikipedia

    en.wikipedia.org/wiki/Relative_density

    If the relative density is exactly 1 then the densities are equal; that is, equal volumes of the two substances have the same mass. If the reference material is water, then a substance with a relative density (or specific gravity) less than 1 will float in water. For example, an ice cube, with a relative density of about 0.91, will float.

  3. Density of air - Wikipedia

    en.wikipedia.org/wiki/Density_of_air

    At IUPAC standard temperature and pressure (0 °C and 100 kPa), dry air has a density of approximately 1.2754 kg/m 3. At 20 °C and 101.325 kPa, dry air has a density of 1.2041 kg/m 3. At 70 °F and 14.696 psi, dry air has a density of 0.074887 lb/ft 3.

  4. Compressibility factor - Wikipedia

    en.wikipedia.org/wiki/Compressibility_factor

    For a gas that is a mixture of two or more pure gases (air or natural gas, for example), the gas composition must be known before compressibility can be calculated. Alternatively, the compressibility factor for specific gases can be read from generalized compressibility charts [ 1 ] that plot Z {\displaystyle Z} as a function of pressure at ...

  5. Atmosphere of Earth - Wikipedia

    en.wikipedia.org/wiki/Atmosphere_of_Earth

    The relative concentration of gases remains constant until about 10,000 m (33,000 ft). ... air pressure and density decrease with altitude in the atmosphere.

  6. Number density - Wikipedia

    en.wikipedia.org/wiki/Number_density

    In SI units, number density is measured in m −3, although cm −3 is often used. However, these units are not quite practical when dealing with atoms or molecules of gases, liquids or solids at room temperature and atmospheric pressure, because the resulting numbers are extremely large (on the order of 10 20).

  7. Density - Wikipedia

    en.wikipedia.org/wiki/Density

    Thus a relative density less than one relative to water means that the substance floats in water. The density of a material varies with temperature and pressure. This variation is typically small for solids and liquids but much greater for gases. Increasing the pressure on an object decreases the volume of the object and thus increases its density.

  8. Ideal gas law - Wikipedia

    en.wikipedia.org/wiki/Ideal_gas_law

    The ideal gas law, ... where P is the absolute pressure of the gas, n is the number density of the ... The relative importance of intermolecular attractions ...

  9. Lifting gas - Wikipedia

    en.wikipedia.org/wiki/Lifting_gas

    The type of gas used is largely inconsequential because the relative differences between gases is negligible in relation to the density of water. However, some gases can liquefy under high pressure, leading to an abrupt loss of buoyancy. A submerged balloon that rises will expand or even explode because of the strong pressure reduction, unless ...