Defrosting is necessary to rid the cooling pipes of a refrigerator of ice formed over them. The thick crust of ice prevents the refrigerator from absorbing more heat from the refrigerator/freezer contents hence it needs to be defrosted so that the encrusted ice over the circulation pipes carrying the refrigerant can be melted away so that the refrigerator can work more efficiently.
Defrosting food allows for even and thorough cooking of the meat. Without defrosting a meat may cook unevenly or the center may not reach proper temperature; allowing for unsafe consumption in some foods (i.e. poultry, pork, ground beef, etc.).
However, food items such as frozen vegetables do not need to be defrosted before cooking.
If in doubt, just follow a recipe for cooking directions.
Because the internal temperature of the juice counteracts the room temperature
Cold air settles, warm air rises. Frozen goods are maintained below 32 degrees, and thus remain frozen.
To keep up the efficiency
RUNNING COSTS WITHIN DESIREABLE LIMITS
So it's easier to cook and so that you can be sure of a thorough even cook.
Manual defrost is the instructions for you to manually defrost your freezer and automatic defrost is saying the freezer defrost on it's own.
freezer!
The advantages to purchasing an upright freezer are probably that they have racks which make organising food easier and they have manual or self defrost models
They buy it from a supermarket, then put it in their freezer to keep fresh, and they then eat it when they're hungry.
The Frigidaire FFC0511 Chest Freezer is equipeed with automatic defrost.
I believe the obvious would be the benefit, you would not have to manually defrost the freezer, bbesides that there is no difference.
Relay
Allowing frozen food to thaw either by leaving out in room temperature or in a microwave defrost cycle. Or when a refrigerator temporarily warms up to melt away frost in the freezer compartment.
The Maytag freezer model MQU1654BEW is designed as a manual defrosted unit and doesn't feature an auto defrost.
There is an automatic defrost setting that user reviews indicate is mostly effective.
Unlike our hunter, gathering ancestors, we can go to a supermarket, or store food in a fridge or freezer. Therefore, eating more food was a natural consequences.
This food should be safe to eat. If this food was kept frozen for the whole time it was in the freezer it is still good. You can cook it however you choose to.