Potato vs Watermelon - Smarter Every Day 155 | Summary and Q&A

TL;DR

Watch as Destin tests the power of a potato gun in slow motion, demonstrating the importance of obturation and the effects of pressure and volume.

Key Insights

• ☠️ Choosing the right propellant with a suitable burn rate is crucial for optimal performance.
• 🥔 Obturation is essential for maximizing the compression and velocity of the potato gun.
• 🤘 Strengthening the potato by adding metal can improve the gun's impact on the target.
• 🖐️ Pressure, volume, and velocity play significant roles in the performance of a potato gun.
• 🔫 Decreased pressure inside the gun can lead to the condensation of water vapor.
• 🐢 Slow-motion footage provides fascinating insights into the dynamics of the potato gun.
• ❓ Audible.com sponsors the Smarter Everyday channel, offering a variety of audiobooks for listeners to enjoy.

Transcript

Hey it's me Destin, welcome back to Smarter Every Day. I have built a potato gun out of clear pipe which is amazing because you can see what's going on on the inside of the potato gun. Today's experiment is going to be pretty fun. Please excuse my scratchy voice but this is my only day off of work. This is my buddy. What are you going to do to help... Read More

Questions & Answers

Q: What is the purpose of obturation in a potato gun?

Obturation refers to creating a complete seal around the potato in the gun, maximizing compression and velocity by preventing air from escaping around the bullet.

Q: Why does the potato keep breaking upon impact?

The potato breaks upon impact because it lacks strength, causing it to shatter. This is why Destin decides to fortify it by adding metal to the front.

Q: How does pressure, volume, and velocity affect the performance of a potato gun?

As the propellant ignites, pressure increases, causing the potato to move down the barrel. The expanding volume behind the potato can lead to a decrease in pressure if the burn rate doesn't keep up. Different propellants burn at different rates, impacting performance.

Q: What can happen if the pressure inside the potato gun decreases too much?

When pressure inside the gun decreases below atmospheric pressure, water vapor in the air can condense. This can create interesting visual effects, as seen in some slow-motion clips.

Summary & Key Takeaways

• Destin builds a potato gun using clear pipe to observe the inner workings, and he tests its power using various ammunition like squash and watermelon.

• The key to maximizing the gun's power lies in obtaining a complete obturation seal around the potato, preventing the explosion from escaping.

• Despite initial failures, Destin fortifies the potato by adding metal and achieves successful results.