[5] W WANG. Improvement on the demonstration device of overweight and weightlessness. Physics Experimentation, 37, 64-65(2017).
[7] V V MAIER, E I VARAKSINA, V A SARANIN. Lecture demonstrations of a drop’s jump to weightlessness. Physics-Uspekhi, 59, 108-113(2016).
[8] J J BALUKOVIC. Teaching and learning the concept of weightlessness: An additional look at physics textbooks. European Journal of Physics Education, 9, 1-14(2018).
[10] H KRUGLAK. Demonstrations of weightlessness. American Journal of Physics, 30, 929-930(1962).
[11] G AN. On the teaching design of overweight and weightlessness. The Science Education Article Collects, 12, 165-166(2013).
[19] M W ZEMANSKY. Heat and thermadynamics(1968).