1. Ilang percent ba ng fuel and air mixture ang kailangan para enough na matungkab yung walls pag sumabog?

Ang alam ko may isang incident sa may Sta. Mesa ata, sumabog yung bahay dahil lang sa super kalan.

12 hurt in LPG tank explosion | Metro, News, The Philippine Star | philstar.com

2. What is your definition of completely sealed? Kung open ang doors and windows nung nangyari yun, malamang di ganun katindi yung damage sa walls nun.

Remember at certain speeds, kahit yung tubig nagiging equivalent yun sa semento at the point of impact and even the atmosphere (that is why we have meteorites).