Learn how a fish bladder works using an eye dropper.
Object Lesson: Design can be seen in everything...FISH were designed for underwater by the Designer.
Supplies: Grab an eye dropper, an empty bottle with cap, and a bowl.
Steps: Fill the empty BOTTLE up with water leaving about 4 inches of air at the top. Fill your bowl up with
water and place your eye dropper in it...now fill the EYE DROPPER approximately 2/3 with water. I like to
make sure the EYE DROPPER barely floats in the bowl...(makes it easier later!)
Now open the BOTTLE of water and drop the EYE DROPPER in and replace the cap.
Finally squeeze the BOTTLE (as hard as you need to) and watch the EYE DROPPER.
The EYE DROPPER should rise and fall as you squeeze the bottle.
How it works: Squeezing the bottle causes more water to be added to the eye dropper and shrinks the
air in the eye dropper causing it to fall.
Object Lesson: God designed fish with a swim bladder that is similar to this process allowing fish to
adjust their buoyancy. Oxygen and nitrogen are passed from the blood stream into the swim bladder. If a
fish needs to swim deeper, gas is reabsorbed from the bladder, deflating it. If the fish needs to rise to a
higher level in the water, the bladder is inflated with gases.
Memorize: Genesis 1:21-24 Then God said, “Let the waters abound with an abundance of living
creatures, and let birds fly above the earth across the face of the firmament of the heavens.” So God
created great sea creatures and every living thing that moves, with which the waters abounded, according
to their kind, and every winged bird according to its kind. And God saw that it was good. And God
blessed them, saying, “Be fruitful and multiply, and fill the waters in the seas, and let birds multiply on the
earth.” So the evening and the morning were the fifth day. NKJV
Based on "Genesis for Kids" by Robert Stevenson and Doug Lambier. Tommy Nelson Publishing. Photos
from Experiland, Young Engineers Club, and Google.
1) Always have a parent
2) Always wear the correct
3) Never eat or drink
anything while performing
are safe to do when the
instructions are followed
correctly. Remember to
use common sense and
wear safety goggles.
expressly disclaim all
liability for any occurrence
including, but not limited
to, damage, injury, or
death, which might arise
as consequences of the
use of any experiments
online. All liability is
assumed by the child's
guardian or experiment
supervisor. Do these
experiments at your own
"Making Creation Splat~tacular!"