What is a tight pressure gradient?

journey of entrepreneurs on Instagram: "Imagine building a rocket that actually works... using only water and plastic bottles. 🚀 In a small village in China, one student decided to bring NASA-level engineering to his backyard. While others were playing games, he was calculating pressure and aerodynamics. This viral water rocket isn't just a toy—it's a masterpiece of DIY aerospace. ​He spent over 8 months refining the design, dealing with leaks, explosions, and failed parachutes. But when you se