spontaneous change
[/spɒnˈteɪniəs tʃeɪndʒ/]
nounfemininepl: mudanças espontâneas
mudança espontânea
1. A transformation or alteration that occurs naturally without external force, planning, or deliberate intervention; often used in thermodynamics to describe processes that occur naturally in a given direction
The spontaneous change in the chemical reaction released energy without any external heat source.
A mudança espontânea na reação química liberou energia sem qualquer fonte de calor externa.
2. In chemistry and thermodynamics, a process that will proceed on its own under given conditions, typically associated with negative Gibbs free energy
A spontaneous change is thermodynamically favorable and will occur naturally.
Uma mudança espontânea é termodinamicamente favorável e ocorrerá naturalmente.
3. An unexpected or unplanned shift in circumstances, behavior, or conditions that happens naturally
The spontaneous change in her attitude surprised everyone at the meeting.
A mudança espontânea em sua atitude surpreendeu todos na reunião.
This term is primarily used in scientific, academic, and technical contexts in both Brazilian Portuguese and European Portuguese. In Brazil, it's commonly encountered in chemistry and physics courses. Informally, Brazilians might use 'mudança do nada' (change from nowhere) to describe unexpected spontaneous changes in everyday situations. In Portugal, the term maintains its formal, scientific connotation. The concept is fundamental to thermodynamics education in both regions.
NYC Slang
a change that just goes down on its own; no cap changes
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