Film Canister Rockets: Science Experiment for Kids
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Looking for a quick, exciting, and educational science experiment? These Film Canister Rockets are a kid favorite that combine chemistry, physics, and a little explosive fun! They’re simple to set up, use just a few materials, and demonstrate cause and effect in a way kids will never forget.
Kids LOVE the surprise launch, and parents love how easy this STEM activity is to set up. It’s perfect for summer science camp, backyard STEM fun, homeschool science, or classroom learning.
Why Kids Love Film Canister Rockets
This activity is:
- fast and exciting
- hands-on and interactive
- easy to set up
- great for outdoor play
- packed with real science concepts
It’s one of those experiments kids want to repeat over and over while testing new variables and trying to make their rockets fly even higher!
Supplies Needed
- Empty film canisters with tight-sealing lids
(available online or at craft/science stores) - Alka-Seltzer tablets or other effervescent tablets
- Water
Optional decorating supplies:
- Paper
- Tape
- Markers
- Stickers
- Glitter
- Ribbon
How to Make a Film Canister Rocket
-
Decorate your canister (optional):
Wrap paper around the canister’s body and tape it in place, leaving the lid end uncovered. You can even cut out a paper circle, snip a slit, and roll it into a cone to tape on top. -
Add the fuel:
Fill the canister about one-third full with water. -
Drop in the tablet:
Break an Alka-Seltzer tablet into a few small pieces and drop one into the canister. -
Quickly seal and launch:
Snap the lid on tightly, flip the canister lid-side down, and place it on a flat surface outside. -
Stand back!
Within seconds, pressure builds inside as carbon dioxide gas forms. The lid pops off and the rocket launches into the air!
(Tip: this experiment gets messy, so definitely do it outdoors!)
The Science Behind Film Canister Rockets
This experiment demonstrates a chemical reaction and Newton’s Laws of Motion.
When the Alka-Seltzer tablet mixes with water, the citric acid and sodium bicarbonate react to produce carbon dioxide gas (COâ‚‚).
As the gas builds up inside the sealed canister, pressure increases. Eventually the pressure becomes strong enough to force the lid off.
The escaping gas pushes downward, launching the canister upward into the air. This demonstrates thrust and Newton’s Third Law of Motion, which states:
For every action, there is an equal and opposite reaction.
As the gas rapidly escapes downward, it creates an opposite force that pushes the rocket upward. Real rockets use the same principle, although they rely on much more powerful fuels and engines.
This activity is a fun and memorable way for kids to explore:
- chemical reactions
- gas pressure
- force and motion
- Newton’s Laws of Motion
- engineering design
STEM Learning Extensions
Turn this into a full STEM investigation by experimenting with different variables.
Try testing:
- different amounts of water
- warm vs. cold water
- half tablets vs. whole tablets
- different rocket designs
- different canister sizes
Ask kids:
- Which rocket flew the highest?
- Which variable changed the launch speed?
- How does pressure affect the launch?
- What design improvements could you make?
You can also:
- measure launch distance
- graph results
- record launch times
- compare data between trials
This activity is a great introduction to:
- chemistry
- force and motion
- engineering design
- observation and experimentation
Grab the Free STEM Lab Sheet
Want to turn this activity into a complete STEM lesson?
Download my free printable STEM Lab Sheet to help kids:
- make predictions
- record observations
- test variables
- compare results
- think like scientists
It’s an easy way to add scientific method practice to hands-on summer learning.
Safety Tips
- Always launch outdoors
- Step back immediately after sealing the lid
- Never lean over the canister after adding the tablet
- Supervise younger children closely
Summer Science Camp
This activity is also included in my Summer Science Camp — a collection of hands-on STEM projects, outdoor science activities, and printable learning pages designed to make summer learning fun and easy.
Perfect for:
- homeschool families
- summer enrichment
- camps
- classrooms
- bored kids on hot afternoons
If your kids love hands-on science, be sure to check it out!
More Rocket and STEM Experiments for Kids
If your kids enjoyed this project, try these other exciting STEM activities:
