def Mach(V, c):
    """Calculates Mach number or `Ma` for a fluid of velocity `V` with speed
    of sound `c`.

    .. math::
        Ma = \\frac{V}{c}

    Parameters
    ----------
    V : float
        Velocity of fluid, [m/s]
    c : float
        Speed of sound in fluid, [m/s]

    Returns
    -------
    Ma : float
        Mach number []

    Notes
    -----
    Used in compressible flow calculations.

    .. math::
        Ma = \\frac{\\text{fluid velocity}}{\\text{sonic velocity}}

    Examples
    --------
    >>> Mach(33., 330)
    0.1

    References
    ----------
    .. [1] Green, Don, and Robert Perry. Perry's Chemical Engineers' Handbook,
       Eighth Edition. McGraw-Hill Professional, 2007.
    .. [2] Cengel, Yunus, and John Cimbala. Fluid Mechanics: Fundamentals and
       Applications. Boston: McGraw Hill Higher Education, 2006.
    """
    return V / c
