The word incubate in the context of birds refers to the development of the chick (embryo) within the egg and the constant temperature required for the development of it over a specific period. This, in most species of bird is produced by endothermic body heat from the brooding parent, though several groups, notably the Megapodes use the heat generated from rotting vegetable material, effectively a giant compost heap instead.
Climate-controlled incubators are used in industrial agricultural settings and in neonatal care, especially of human infants. Incubators have greatly increased life-expectancy for premature infants.
In economics, an incubator is a set of resources such as physical space, communications tools, investments or human resources intended to promote development of business or technology.
The incubation process covers the establishment of a candidate, acceptance (or rejection) of a candidate leading to the potential establishment of a Podling and associated incubation process, which ultimately leads to the establishment or a new Apache Top-Level-Project (TLP) or sub-project within an existing Apache Project.
In cases where a Podling has successfully completed Incubation, and is graduating from the Incubator to become a Top Level Project, the Incubator PMC SHALL provide a recommendation to the board that the Podling is ready to gradualate.
In cases where a Podling has successfully completed Incubation, and is graduating from the Incubator to become a sub-project within an already existing Top Level Project, the Incubator PMC SHALL provide a recommendation to the TLP that the Podling is ready to graduate.
A proper response depends on several factors, some of which include the temperature of the room in which the incubator is located, the number of eggs in the machine, and whether the eggs are in the early or late stage of incubation.
In a still-air incubator, where the eggs are turned by hand, it may be helpful to place an "X" on one side of each egg and an "O" on the other side, using a pencil.
In large commercial incubators, eggs of different ages are often set and each setting transferred to a separate unit prior to hatching.