Humidity, plain heat will just dessicate things.
They need rest and warmth. Newly hatched chicks should be left in the incubator for at least 24 hours. They do not need food and as long as the humidity is at 80%within that incubator they will not need water. Chicks should be dry and fluffy before being moved into the brooder box when they will get their first food and water ration.
If you don't put water in an incubator , bad things will happen to your bike , but not while your ridding it .
If you can breathe in the room the incubator is located in then you will not need to supplement the air they need. Incubators are not airtight.
A small amount of the egg content has to evaporate, to give the chick room to move inside the shell. Too much water slows this evaporation. You need to check the manual for your incubator for the correct amount of water.
no
Depends on if you have a broody hen. If the hen is brooding then you do not need to incubate, if you have no natural brooder then yes, an incubator is needed.
use fertilized eggs
An incubator is used to hatch fertile eggs artificially. Nothing will hatch from an unfertilised egg.
never
Any non-viable eggs need to be removed, and whatever can be cleaned up should be.
The incubator used by the silk farmers is not large because the eggs of the moths are each smaller than the head of a pin.