What principles are involved in the following preservation methods:
Salting
Oil
Heat and cold treatment
Answers
(a.)Dehydrating works on this same principle, many types of food such as fruits, vegetables, meat and fish is dried. ... The mechanism that is in effect when we salt foods to preserve them is osmosis. Osmosis works by drawing water across a cell membrane so that both sides have an equal amount of saltiness or salinity.
(b.)Lubrication is a process which aims at reducing friction between two moving pieces. When two surfaces come in contact with one another, a fluid must be injected to separate them. The word greasing applies when grease is used to lubricate.
(c.)In both methods, the food is heated for a short period of time and then introduced into either cold water or cold air to quickly stop the heating process. At the industrial level, foods move on a continuous conveyor belt through preheating, holding, and cooling.
Explanation:
(a.)Dehydrating works on this same principle, many types of food such as fruits, vegetables, meat and fish is dried. ... The mechanism that is in effect when we salt foods to preserve them is osmosis. Osmosis works by drawing water across a cell membrane so that both sides have an equal amount of saltiness or salinity.
(b.)Lubrication is a process which aims at reducing friction between two moving pieces. When two surfaces come in contact with one another, a fluid must be injected to separate them. The word greasing applies when grease is used to lubricate.
(c.)In both methods, the food is heated for a short period of time and then introduced into either cold water or cold air to quickly stop the heating process. At the industrial level, foods move on a continuous conveyor belt through preheating, holding, and cooling.