The method of measuring of glass refractive index is improved, and then a simple display on the phenomena of overweight and weightlessness is given.

The feeling is too different as in an aircraft especially in the small aircraft compared to being on the ground or in a car because the airflow can make a great affection on this kind of aircraft.

The potentially savable victims, whose lives wouldn't be threatened with bad wound and wouldn't die in a short time, should be given the priority of transfer by helicopter.