Hi there, and a big thank you up front for reading this. I had a jar of veggie soup explode on me last summer. I have read everything and can't find out why. This is what transpired that evening.... Hubby is canning quart jars of soup. They finish, and he lets out the pressure. Lets it sit for a good while. There is a towel on our countertop to set them on. He is proud, so I watch. The air conditioner is going, but pretty far away. We don't have central heat and air. The air conditioner is in kitchen, on the opposite side of the jars. Then it happened. One of the jars exploded on me. My husband covers the other jars in case they blow too. I was okay, just still have scars on my face and hand. Why did this happen? He measured correctly, jars seemed fine before. I just don't want this happening again. If I left out anything, please ask. Just need answers, so I can get closure on this.