How to Make a Pop Can Crusher

Air pressure from hot and cold water causes cans to implode.

With the green movement growing ever larger, recycling is more important than ever. Since recycled items like aluminum cans are usually melted down during the recycling process, their shape doesn't matter. If you crush cans before recycling, you can place more of them in a single bag or bin. You don't need to purchase a fancy can crusher. Instead, try building one with a little water and some science.

Things You'll Need

• 5- to 10-gallon plastic bucket
• Electric grill
• Aluminum cans
• Tongs

Instructions

1. Set a large plastic bucket next to your electric grill. It has to be within very easy reaching distance. Fill the bucket with cool water.

2. Turn your grill on to medium high. Pour about 2 tbsp. of cool water into the bottom of each can you plan to crush. Place them on the grill about 2 inches apart.

3. Allow the cans to heat for about three minutes, or until you hear the water inside start to bubble. Grip the bottom of the nearest can with tongs. Lift it straight up into the air, turn it over, and plunge it into the cold water all in one motion. The can will collapse because of opposing temperatures.

4. Continue plunging all of your cans into the water. You can let the cans float in the water until you're finished or set them in a pile to the side.

Tips & Warnings

• Replace the electric grill with a grill pan on your stovetop. Turn on the two burners under the pan to medium high. You can also fill your sink with water instead of a bucket.

References

• Steve Spangler Science: The Incredible Can Crusher
• Sci Fun: The Collapsing Can
• Ohio State University: Crush the Can