Place the eyedropper into the soda bottle. The eyedropper should float and the water in the bottle should be overflowing. Seal the bottle with the cap.
Practice making the diver go up and down without making it look like you're squeezing the bottle. Amaze your friends with your ability to make the eyedropper obey your commands!ลองฝึกวิธีที่ทำให้นักดำน้ำขยับขึ้นลง โดยที่มองไม่ออกว่าคุณกำลังบีบขวดอยู่ เพื่อนๆอาจจะสงสัยในพลังลึกลับที่ทำให้ที่หยดฟังคำสั่งของเรา
How does it work? มันทำงานอย่างไร
Squeezing the bottle causes the diver to sink because the increased pressure forces water up into the diver, compressing the air at the top of the eyedropper. This increases the mass, and density, of the diver causing it to sink. Releasing the squeeze decreases the pressure on the air at the top of the eyedropper, and the water is forced back out of the diver.
