Proceeding from, or acting by, internal impulse, energy, or natural law, without external force; as, spontaneous motion; spontaneous growth.
occuring without outside influence.
A spontaneous process is defined as one which will either occur immediately at room temperature, or which, once initiated by heating, will sustain itself until the start materials are exhausted.
happening or arising without apparent external cause; "spontaneous laughter"; "spontaneous combustion"; "a spontaneous abortion"
the ability for the completion of the forward thermodynamic reaction to occur where a negative Gibb's free energy must exist.
A movement or feeling that comes from an impulse without outside influence.
Spontaneous processes do not require work to be done in order to occur.
spontaneity; spontaneous process; spontaneous reaction. A spontaneous process occurs because of internal forces; no external forces are required to keep the process going, although external forces may be required to get the process started. For example, the burning of wood is spontaneous once the fire is started. The combination of water and carbon dioxide to reform the wood and oxygen is NOT spontaneous
a spontaneous change will occur by itself. However, there is nothing in the concept of a spontaneous reaction that tells how fast the reaction is occurring (this depends on the temperature, and the activation energy). A spontaneous reaction may be either fast, or slow. For a reaction to occur spontaneously there must be an increase in the entropy of the universe, or the Gibbs free energy change must be less than 0.
When something happens all of a sudden or by itself. Happening or arising without apparent external cause; self-generated.
A process that occurs without external influence or excitement. For example, the rusting of metal is a spontaneous process because no force is required to start the process.