Arc Flash Boundary (ARC) - is the distance at which an electrical arc can flash. outward, which may endanger employees working on electrical equipment. Flash Protection Boundary (FPB) - theJcalculated safe working distance from. electrical equipment which would not expose the employee to the hazards.
One advantage of freeze drying is that food preserved in this method can last longer than food preserved in virtually any other way. Freeze dried foods, if stored properly, can last for years, even decades, and taste exactly as they did the day they were bought fresh.
1 Drying. 2  Drying is an ancient technique of food preservation and works well for many food types. 3  It is an inexpensive method of food preservation, as you rely on the sun or an oven. 4  Dried foods are compact and easily stored or carried. Some of these losses can be mitigated by not drying the food too long. 2  Salting: Salt is another ancient method of preservation. 3  Salt can be used as part of the drying process. 4  Salt increases the storage time of some foods such as fish and it enhances the flavour of dried foodstuffs.