cavity
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cavity / hollow space
An empty space or gap inside a solid body, a wall, or another structure.
Zwischen der Innen- und Außenwand des Hauses befindet sich ein Hohlraum zur Isolierung.
Between the inner and outer wall of the house, there is a cavity for insulation.
'Hohlraum' (cavity) is made up of the adjective 'hohl' (hollow) and the noun 'der Raum' (space/room). So it literally describes a space that is hollow inside.
Der hohle Baumstamm bot den Vögeln einen geschützten Nistplatz.
The hollow tree trunk offered the birds a sheltered nesting place.
You can tell from context whether a technical or an anatomical 'Hohlraum' (cavity) is meant. In construction, it is about walls and materials; in medicine, it is about the body and its organs.
Im Bauwesen spricht man von Hohlräumen in Wänden, in der Medizin von Hohlräumen im Körper.
In construction, people speak of cavities in walls; in medicine, of cavities in the body.
In technical or craft contexts, people often describe how a cavity forms, what it is used for, or how it is filled. Common verbs are 'entstehen' (to form/arise), 'füllen' (to fill), or 'schaffen' (to create).
Der Specht zimmert einen Hohlraum in den Baum, um dort zu nisten.
The woodpecker chisels a cavity into the tree in order to nest there.
In medicine and biology, 'Hohlraum' (cavity) refers to a natural body cavity. A well-known example is the paranasal sinuses, which are cavities in the skull bone.
Der Brustkorb ist ein Hohlraum, der die Lunge und das Herz schützt.
The chest cavity is a hollow space that protects the lungs and the heart.
soul
'die Seele' and 'der Hohlraum' can both refer to an empty space inside something. 'Hohlraum' is the normal general word for this kind of inner empty area, for example in a wall or in an object. 'Seele' is used with this meaning only in special technical contexts, such as with certain weapons or instruments. If you are not talking about such a specialist field, 'Hohlraum' is usually clearer and more natural.
Hinter der lockeren Fliese befindet sich ein kleiner Hohlraum.
There is a small cavity behind the loose tile.
Bei der Reparatur sah der Musiker vorsichtig in die Seele des Instruments.
During the repair, the musician carefully looked into the inside of the instrument.