Vanishing Water Ball Experiment
In this science experiment you explore super absorbent polymers and light refraction. In the
process we will make some really cool polymer water balls that appear magically when
scooped out of water and simply vanish when we drop them back into the water.
What you Need:
1. Packet of Water Pearls
2. Water
3. Clear Bowl
Process for Vanishing Water Ball Experiment:
1) Purchase a pack of super absorbent
polymer clear water pearls.
2) Get a large bowl
and fill with distilled water.
3) Pour the clear water pearl seeds into
the bowl of distilled water. The pearl seeds start off
about 1/8 of an
inch and will absorb water becoming around 3/4 inches.
4) Allow the super
absorbent polymer clear pearl seeds to sit for a few hours and grow.
5)
Dip your hand into the bottom of the bowl and scoop up some water. Magically the
water balls
will appear as you take your hand out of the
water.
6) Drop the water balls back into the water and they vanish
becoming invisible to the eye!
The Science Behind The Vanishing
Water Ball Experiment
The clear water pearls are super
absorbent polymers that can hold up 300 times their original weight in
water. Polymers are individual molecules linked together to form long chains of
molecules. Anything made of plastic is a form of a polymer. When there
is no water in the bowl,
you can see objects (like the clear water
pearls) inside the bowl perfectly . This occurs because
rays of light
scatter as they hit the objects in the bowl making them visible. After the clear
water
pearls absorb and fill with water they become invisible once
submerged in water. This happens
because the water filled clear pearls
have the same index of refraction as the water itself. As you
remove
the pearls from the water light refracts against the pearls making them visible.
As you
drop them back in the water, the index of refraction for the
pearls becomes the same as the
water making them vanish! Clear Water
Pearls go by many names, jelly marbles, clear
spheres, water balls,
water crystals.
Source:
http://weirdsciencekids.com/Vanishingwaterballs.html