Fill the bag ¾ full with water and seal it tight. Do this over a sink in case the seal gets stretched. Hold the top of the bag with one hand. With the other hand, take a pencil and gently push it through the bag into the water. Keep pushing until the pencil sticks out the other side of the bag. 1 2 Repeat until all of the pencils have been pushed through the bag. When you remove the pencils, do it over a sink. 3 6 very sharp pencils water 1 gallon-sized resealable plastic bag MATERIALS INSTRUCTIONS What’s Going On? The plastic bag is made from long, flexible strands of a polymer called low-density polyethylene. The sharp pencil point pushes the strands of molecules aside as you move it through the bag. Leaving the pencil in place plugs the open- ing you made. It finally leaks when you remove the pencils because the polymer strands are not flexible enough to return to their original shape. © 2018 Little Passports littlepassports.com

What’s Going On?...What’s Going On? The plastic bag is made from long, ˜exible strands of a polymer called low-density polyethylene. The sharp pencil point pushes the strands

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Page 1: What’s Going On?...What’s Going On? The plastic bag is made from long, ˜exible strands of a polymer called low-density polyethylene. The sharp pencil point pushes the strands

Fill the bag ¾ full with water and seal it tight. Do this over a sink in case the seal gets stretched.

Hold the top of the bag with one hand. With the other hand, take a pencil and gently push it through the bag into the water. Keep pushing until the pencil sticks out the other side of the bag.

1 2 Repeat until all of the pencils have been pushed through the bag.

When you remove the pencils, do it over a sink.

6 very sharp pencils water1 gallon-sized resealable plastic bag

MATERIALS

INSTRUCTIONS

What’s Going On?The plastic bag is made from long, �exible strands of a polymer called low-density polyethylene. The sharp pencil point pushes the strands of molecules aside as you move it through the bag. Leaving the pencil in place plugs the open-ing you made.

It �nally leaks when you remove the pencils because the polymer strands are not �exible enough to return to their original shape.

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