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In any case, the context and/or unit of the gas constant should make it clear as to whether the universal or specific gas constant is being referred to. [ 10 ] In case of air, using the perfect gas law and the standard sea-level conditions (SSL) (air density ρ 0 = 1.225 kg/m 3 , temperature T 0 = 288.15 K and pressure p 0 = 101 325 Pa ), we ...
The constants listed here are known values of physical constants expressed in SI units; that is, physical quantities that are generally believed to be universal in nature and thus are independent of the unit system in which they are measured. Many of these are redundant, in the sense that they obey a known relationship with other physical ...
Under these conditions, p 1 V 1 γ = p 2 V 2 γ, where γ is defined as the heat capacity ratio, which is constant for a calorifically perfect gas. The value used for γ is typically 1.4 for diatomic gases like nitrogen (N 2) and oxygen (O 2), (and air, which is 99% diatomic).
A mathematical constant is a key number whose value is fixed by an unambiguous ... Universal parabolic constant ... 1, 2, 1, 1, 4, 1, 1, 6, 1, 1, 8, 1 ...
One way to write the van der Waals equation is: [6] [7] [8] =, where is pressure, is the universal gas constant, is temperature, is molar volume, and and are experimentally determinable, substance-specific constants.
The van der Waals equation of state may be written as (+) =where is the absolute temperature, is the pressure, is the molar volume and is the universal gas constant.Note that = /, where is the volume, and = /, where is the number of moles, is the number of particles, and is the Avogadro constant.
Arrhenius originally considered A to be a temperature-independent constant for each chemical reaction. [6] However more recent treatments include some temperature dependence – see § Modified Arrhenius equation below. E a is the molar activation energy for the reaction, R is the universal gas constant. [1] [2] [4]
, the specific gas constant for dry air, which using the values presented above would be approximately 287.050 0676 in J⋅kg −1 ⋅K −1. [note 1] Therefore: At IUPAC standard temperature and pressure (0 °C and 100 kPa), dry air has a density of approximately 1.2754 kg/m 3.