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.
Pork does not keep as long as beef in the freezer. Like beef, it is best to flash freeze pork. Larger cuts also tend to keep longer than smaller cuts such as chops. Pork roasts will keep for up to 8 months when well wrapped. Chops and ground pork should be frozen for no more than 4 months.