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  2. Compressibility factor - Wikipedia

    en.wikipedia.org/wiki/Compressibility_factor

    Compressibility factor values are usually obtained by calculation from equations of state (EOS), such as the virial equation which take compound-specific empirical constants as input. 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.

  3. Standard normal table - Wikipedia

    en.wikipedia.org/wiki/Standard_normal_table

    Example: To find 0.69, one would look down the rows to find 0.6 and then across the columns to 0.09 which would yield a probability of 0.25490 for a cumulative from mean table or 0.75490 from a cumulative table. To find a negative value such as -0.83, one could use a cumulative table for negative z-values [3] which yield a probability of 0.20327.

  4. Zadoff–Chu sequence - Wikipedia

    en.wikipedia.org/wiki/Zadoff–Chu_sequence

    A Zadoff–Chu (ZC) sequence, also referred to as Chu sequence or Frank–Zadoff–Chu (FZC) sequence, [1]: 152 is a complex-valued mathematical sequence which, when applied to a signal, gives rise to a new signal of constant amplitude.

  5. Acentric factor - Wikipedia

    en.wikipedia.org/wiki/Acentric_factor

    The acentric factor ω is a conceptual number introduced by Kenneth Pitzer in 1955, proven to be useful in the description of fluids. [1] It has become a standard for the phase characterization of single and pure components, along with other state description parameters such as molecular weight, critical temperature, critical pressure, and critical volume (or critical compressibility).

  6. Redlich–Kwong equation of state - Wikipedia

    en.wikipedia.org/wiki/Redlich–Kwong_equation_of...

    The Redlich–Kwong equation was developed with an intent to also be applicable to mixtures of gases. In a mixture, the b term, representing the volume of the molecules, is an average of the b values of the components, weighted by the mole fractions: =, or

  7. Find and remove unusual activity on your AOL account

    help.aol.com/articles/find-and-remove-unusual...

    Monitoring your recent login activity can help you find out if your account has been accessed by unauthorized users. Review your recent activity and revoke access to suspicious entries using the info below. Remove suspicious activity. From a desktop or mobile browser, sign in and visit the Recent activity page. Depending on how you access your ...

  8. Elementary charge - Wikipedia

    en.wikipedia.org/wiki/Elementary_charge

    In the SI system of units, the value of the elementary charge is exactly defined as = 1.602 176 634 × 10 −19 coulombs, or 160.2176634 zeptocoulombs (zC). [3] Since the 2019 revision of the SI, the seven SI base units are defined in terms of seven fundamental physical constants, of which the elementary charge is one.

  9. What is the actual cash value of my car? - AOL

    www.aol.com/finance/actual-cash-value-car...

    This value will also include a profit margin for the dealer. Certified pre-owned value: A certified pre-owned value is the value of a vehicle that has been inspected by third-party inspectors ...