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.
Fridge time: 3 to 5 days- vacuum-packed products can have an extended storage time (see instructions on package for guidance). Freezer time: If a freezer stays at 0 F or lower, meats will keep for several months. 1  Roasts- six to 12 months. 2  Steaks and chops- four to six months.  Stew meats- three or four months.