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.
Frozen Pork Storage. Raw pork chops can be safely frozen for up to six months. Raw pork roasts can stay in the freezer for as long as one year. Cooked pork products can be frozen for up to four months. After this time, the meat might be dry and it will have less flavor, although it will still be safe to eat.