1. In thermodynamics and chemistry, natural processes that occur without external energy input, driven by an increase in entropy or decrease in free energy
The dissolution of salt in water is one of the most common spontaneous processes observed in chemistry.
A dissolução de sal em água é um dos processos espontâneos mais comuns observados na química.
2. In general usage, events or actions that happen naturally or instinctively without planning or external force
Spontaneous processes in nature include plant growth and water evaporation.
Os processos espontâneos na natureza incluem o crescimento de plantas e a evaporação da água.