
der Schaum
foam
A mass of many small gas bubbles that forms on or in a liquid, for example with soap, beer, or on ocean waves.
Das Badewasser war voller duftendem Schaum.
The bathwater was full of fragrant foam.
foam
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foam
A mass of many small gas bubbles that forms on or in a liquid, for example with soap, beer, or on ocean waves.
Das Badewasser war voller duftendem Schaum.
The bathwater was full of fragrant foam.

foam
A porous, lightweight material that is manufactured industrially and used for insulation, cushioning, or packaging.
Die neue Matratze ist aus einem speziellen Kaltschaum gefertigt.
The new mattress is made from a special cold foam.

to foam at the mouth
A fixed expression meaning that someone is extremely angry or furious.
Als er die Kratzer an seinem neuen Auto sah, hatte er Schaum vor dem Mund.
When he saw the scratches on his new car, he was foaming at the mouth.

mousse
A light, airy dish that is often served as a dessert; a mousse.
Zum Nachtisch gab es einen leichten Schaum von dunkler Schokolade.
For dessert, there was a light dark chocolate mousse.
The noun 'der Schaum' (foam) is the basis for the verb 'schäumen' (to foam) and the adjective 'schaumig' (foamy). When a liquid foams, it forms foam.
Die Seife schäumt gut, wenn man sie mit Wasser mischt.
The soap foams well when you mix it with water.
The idiom 'Schaum vor dem Mund haben' (to foam at the mouth) means to be extremely angry. The phrase is fixed and is always used in this form to express great rage.
Als der Chef die schlechten Zahlen sah, hatte er Schaum vor dem Mund.
When the boss saw the bad numbers, he was foaming at the mouth.
You can easily recognize the meaning of 'Schaum' (foam) from context. In the bath or on drinks, it is a liquid mass (m01), in mattresses or packaging a solid material (m02), and on menus a dessert (m04).
Auf meinem Cappuccino ist immer viel Milchschaum.
There is always a lot of milk foam on my cappuccino.
When foam is actively produced, the verb 'schlagen' (to beat/whip) is often used. For example, you can beat cream or egg whites into foam.
Für den Kuchen muss man das Eiweiß zu steifem Schaum schlagen.
For the cake, you have to beat the egg whites into a stiff foam.
cream
The Creme on an espresso is a distinctive, dense, golden-brown layer of foam and its usual designation. Schaum is the more general term for a mass of small gas bubbles. For espresso, Schaum is understandable in objective terms, but Creme describes the typical layer more precisely.

Beim Brühen bildet sich feiner Schaum auf dem Espresso.
Fine foam forms on the espresso while it is brewing.
Auf dem frisch gebrühten Espresso liegt eine dichte, goldbraune Creme.
A dense, golden-brown layer of crema sits on the freshly brewed espresso.