Leak-proof Bag?!

Is there such a thing as a leak-proof bag? YES! We learned today that you can fill a Ziploc bag with water, seal it tightly, and then stick pencils through it and it won't leak!!!

Teegan was my science helper and let me hold the bag over his head and poke a pencil through! He was so sure it would leak like a balloon. But it didn't!

To make it more interesting, we used a small Ziploc bag, and a big one.

They tried to make it leak by: 

• Putting a pencil through the bottom. 

• Putting a pencil through the part that has air, and then water. 

• Stretching the Ziploc bag and then putting a pencil through it. 

• Opening the Ziploc bag so it isn't closed tightly. 

• Emptying the bag with the pencils sticking through it, and then filling it up again. 

Polymers are just too tough. :) 


If you'd like to do this at home it's fun and quick! The reason it doesn't leak is because Ziploc bags are made out of polymer. Polymers are molecules which allows it to be very flexible. The molecule "hugs" the pencil when it pokes through the bag, creating a seal. SUPER COOL RIGHT?! 

Part of Mrs. Sanderson's class joined us today for our experiment. :) 

Pacific Science Center

🔎🔬 Today we learned about liquid nitrogen and what happens if you put it in water, what happens when it mixes with gas  (air in a balloon), and what happens what you put a solid in it! 🔎🔬

🐣 Decorating Easter Eggs! 🐇

I am always impressed with the manners my class has when we go on field trips. They were so polite. Some students even made Easter eggs for the elderly women at their table, instead of taking them home. It was such a sweet sight to see.