This maintains the heat transfer between steam and liquid to a maximum. Figure 3 shows a temperature profile when saturated steam is used. The difference with the previous diagram is that there is now a layer of condensate on the heating surface and steam temperature is constant.
As a general rule Owls are monogamous - pairs are comprised of one male and one female, neither one of which has any involvement with other nesting birds. With some Owl species the pair bonds last only for the duration of the breeding season, especially if the species involved is dispersive or migratory.
Not all owls hoot, and owls can make a wide range of other sounds, such as screeches, whistles, barks, growls, rattles and hisses. During the nesting season, owl calls can often be heard up to a mile away. Female owls generally have higher voices than their mates. Not all owl species are nocturnal.