1. With adult
supervision - Using a hammer and
nail, make a small whole (the size
of the straw) in the middle of the
2. Place the straw in the
lid and form a clay ring (air tight
seal) around the straw and lid (about
an inch from the bottom of the straw).
3. Screw the lid on the jar
and place the short end of the straw
through the lid. The clay
should keep the straw from falling
in. Make sure that no air
can pass through the hole around
4. Take your marshmallow and
draw a face on both flat sides.
5. Open the lid and drop the
marshmallow in and screw the lid
6. Hold your mirror to where
you can see the marshmallow in the
bottom of the jar.
7. Now suck the air out of
the jar making sure there are no
leaks in the clay or lid.
happens when you stop sucking on
The marshmallow is
not a solid object.
It has many air pockets
like a sponge.
By sucking the air
out of the jar you decrease the
pressure inside the jar which causes
the marshmallow to decrease in size,
becoming a solid.
you release the straw from your
mouth the air rushes back into the
marshmallow allowing it to return
to its normal size.