def Z(T, P, V):
return V*P/T/R<EOL>
r'''Calculates the compressibility factor of a gas, given its
    temperature, pressure, and molar volume.

    .. math::
        Z = \frac{PV}{RT}

    Parameters
    ----------
    T : float
        Temperature, [K]
    P : float
        Pressure [Pa]
    V : float
        Molar volume, [m^3/mol]

    Returns
    -------
    Z : float
        Compressibility factor, [-]

    Examples
    --------
    >>> Z(600, P=1E6, V=0.00463)
    0.9281019876560912

    References
    ----------
    .. [1] Poling, Bruce E. The Properties of Gases and Liquids. 5th edition.
       New York: McGraw-Hill Professional, 2000.