When the lamp gets hot causes the air to expand until there is some overflow into. If more than 5 makes the total weight is less than 10. It will float. The difference of mass of air from above and below. Cause strong or strong lift
When the lamp is heated, causing the air to expand. I have some left over. I went more than 5 To keep the total weight under 10. It will float to the difference in air masses from above and below. The pushing or lifting.
When the lamp heat makes the air has been expanded, and some flow out. If out over the 5 will ทำให้น้ำหนัก include lower 10 it floats the difference of air mass from the top and bottom. Causing repulsion or lift.