Question

What causes negative entropy?

Answer 1

To answer this question, we first need to understand what entropy is. Entropy is the amount of thermal energy in a system per unit temperature that isn't available for meaningful work. Because work is generated by ordered molecular motion, entropy is also a measure of a system's molecular disorder, or unpredictability. For many daily occurrences, the concept of entropy provides deep insight into the direction of spontaneous change.

Complete answer:
Entropy is a measured physical attribute that is most usually linked with a condition of disorder, unpredictability, or uncertainty. The phrase and concept are utilized in a wide range of domains, from classical thermodynamics, where it was first discovered, to statistical physics' microscopic description of nature, to information theory's principles. It has a wide range of applications in chemistry and physics, biological systems and their relationships to life, cosmology, economics, sociology, weather science, climate change, and information systems, including telecommunications.
Negative entropy – Entropy can be a powerful driver of many chemical reactions, but it is not absolute. Entropy competes with a system's ability to release energy. An electron of hydrogen, for example, may have higher entropy if it travels away from the core proton, but electrostatic forces keep it energetically linked to the atom. To establish which way isobaric processes are driven, you must first determine the change in Gibbs free energy for the reaction. To identify which way a reaction is driven in isochoric processes, you must first determine the Helmholtz free energy.
A decrease in entropy suggests that an isolated system's chaos has lessened. Because liquid particles are more disordered than solid ones, the reaction of liquid water freezing into ice represents an individual drop in entropy
So, we conclude that, when we raise the temperature of any substance in a chemical process, molecular mobility increases, and entropy increases as well. When the temperature of a substance is reduced, molecular mobility is reduced, and entropy is reduced. The tendency in nature is for things to go out of hand.

Note:
Entropy creation (or generation) is the quantity of entropy created by irreversible processes including heat and mass transfer, such as body motion, heat exchange, fluid flow, substances expanding or mixing, anelastic deformation of materials, and any irreversible thermodynamic cycle.