favetelinguis

Im not a since guy but I been thinking about this question for a time now so got an acount here and hopfylle we can sort it out. (Im not a native english speaker so sorry for spelling errors) Is it possible to get an object floating perfecty still at a XYZ coordinate that i put in at the ground without using motors etc. For example can i get a small baloon floating at a hight of say 500meters, 1000meters and so on only using some special gas or special temperature of the air in the baloon. I guess the hardest part would be it staying still in XZ coordinates? Looking forward to any information.