jes možda natrčao i na ovaj pasus:
"there are TWO versions of Crooke's that
turn in OPPOSITE directions. At high vacuum, the reflective sides get
more impulse from light and turn away. At low vacuum, the black side
gets hotter and the air molecules leave the hot side faster so the black
side turns away (slower). At some intermediate vacuum the forces
balance and it doesn't turn...."
p.s. ona ideja sa litarskom flašom i nije najbolje rešenje