to decay / disintegrate
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to decay
To fall apart into individual pieces or slowly become damaged through decay and aging. This often refers to buildings, materials, or organic substances.
Die alte Burg ist über die Jahrhunderte langsam zerfallen.
The old castle slowly decayed over the centuries.
to collapse
In a figurative sense, the dissolution or collapse of an organization, a community, or a structure.
Nach dem Tod des Königs zerfiel das Reich in mehrere kleine Fürstentümer.
After the king's death, the empire collapsed into several small principalities.
to decay
In physics, the process in which an unstable atomic nucleus spontaneously transforms into other particles and releases energy in the process.
Das radioaktive Isotop zerfällt mit einer Halbwertszeit von 5000 Jahren.
The radioactive isotope decays with a half-life of 5,000 years.
'Zerfallen' (to decay / disintegrate) is an inseparable verb. The prefix 'zer-' often means that something breaks, dissolves, or falls into pieces. In combination with 'fallen' (to fall), it creates the literal meaning 'auseinander fallen' (to fall apart).
Das alte Manuskript ist bei der Berührung fast zerfallen.
The old manuscript almost disintegrated when touched.
Since 'zerfallen' (to decay / disintegrate) describes a change of state, the perfect tense is always formed with the auxiliary verb 'sein' (to be). A common source of mistakes is using 'haben' (to have).
Das Römische Reich ist vor langer Zeit zerfallen.
The Roman Empire collapsed a long time ago.
To describe what something breaks down into, the preposition 'in' is used with the accusative. Typical phrases are 'in Staub zerfallen' (to turn to dust) or 'in seine Einzelteile zerfallen' (to fall apart into its individual pieces).
Nach dem Brand ist das Holzgebäude zu Asche zerfallen.
After the fire, the wooden building turned to ash.
In the figurative meaning, 'zerfallen' (to collapse / fall apart) is used for abstract structures such as a 'Reich' (empire), an 'Allianz' (alliance), a 'Regierung' (government), or a 'Familie' (family) to describe their dissolution.
Nach dem Streit ist die Freundschaft der beiden zerfallen.
After the argument, the friendship between the two fell apart.
The meaning of radioactive decay is almost exclusively limited to the technical language of physics and chemistry. Signal words here are 'Atomkern' (atomic nucleus), 'Isotop' (isotope), or 'Halbwertszeit' (half-life).
Wissenschaftler beobachten, wie der Atomkern zerfällt.
Scientists observe how the atomic nucleus decays.
to dissolve / resolve
Auflösen an organization usually means deliberately or officially ending it. Zerfallen, by contrast, describes its unplanned internal collapse. If there is a conscious decision to end it, auflösen is appropriate; if the organization loses its cohesion because of internal problems, zerfallen is appropriate.
Ohne einen solchen Beschluss zerfällt der Verein langsam durch innere Konflikte.
Without such a decision, the association is slowly falling apart because of internal conflicts.
Der Vorstand beschließt, den Verein zum Jahresende aufzulösen.
The board has decided to dissolve the association at the end of the year.
