def rel_err(v_theo:float, v_exp:float) -> float:
    """Computes the relative error between v_theo and v_exp.

    Args:
        v_theo (float): Theoretical value.
        v_exp (float): Experimental value.

    Returns:
        float: Relative error between the values
    """    
    return abs(v_theo - v_exp) / v_theo * 100