Chinese chairs and ass in the ass are devoted.
Stop the panic! Below the seat is a sealed cylinder with a sprinkle and ordinary non-compressed air. When you pull the lever, the cylinder is unsealed, under your weight the springs are compressed, excess air from the cylinder comes out. and vice versa. The suspension is pressed, the air enters the seat rises. Release the lever, the hole in the cylinder is closed and the air does not allow the seat to change position.
And even if you assume a seat with a compressed air balloon, it means it will end and the chair will stop rising. What is "the end of the" chair? and :)
Remove the iron plates from under your ass, get cold!