A Stable Substance does not undergo spontaneous changes under the surrounding conditions.
Spontaneous means natural and unplanned. When you describe an action or event as spontaneous, it means it happened naturally, without having been planned. Spontaneous aims to be a durable, youth-appealing midnight flick in the vein of "Heathers" or "Donnie Darko.
Spontaneous is defined as the act or quality of acting without thinking in advance. Going on a road trip at the very last minute because it seems fun is an example of spontaneity. The quality of being spontaneous.
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