def v_relative(v, met):
    """ Estimates the relative air velocity which combines the average air velocity of the space plus the relative air velocity caused by the body movement.

    Parameters
    ----------
    v : float
        air velocity measured by the sensor, [m/s]
    met : float
        metabolic rate, [met]

    Returns
    -------
    vr  : float
        relative air velocity, [m/s]
    """
    if met > 1:
        return round(v + 0.3 * (met - 1), 3)
    else:
        return v
