Hydrogen gas is very flammable and yields explosive mixtures with air and oxygen. The explosion of the mixture of hydrogen and oxygen is quite loud. Tests should be made prior to the demonstration to adjust the total volume in the balloons so that the sound of the explosion is tolerable in the room.
How long does cooked beef stew last in the freezer? Properly stored, it will maintain best quality for about 4 to 6 months, but will remain safe beyond that time. The freezer time shown is for best quality only - cooked beef stew that has been kept constantly frozen at 0â will keep safe indefinitely.
I personally have used frozen meat that was in my deep freeze foe 2-3 years and it was fine and did not even HAVE freezer burn as it was wrapped well. since freezing stops all bacterial actions, how could it possibly go bad!! You can keep frozen ground beef up to 5 years I think. I found some in the bottom of the freezer that had a frozen on date of 2006! It was still fine. It had fallen down behind the veggie basket.