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The Boomerang Nebula is a young planetary nebula and the coldest object found in the Universe so far, being 1 K (-272 C). Yet, it is never zero.

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Relationship between Entropy, Enthalpy, and Gibbs Free Energy

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Relationship between Entropy, Enthalpy, and Gibbs Free Energy

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Enthalpy is the base amount of  energy a reaction has, while entropy is the energy that goes against it.
Both can be combined to predict a reaction's spontaneit y through free energy.

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A system cannot be cooled to absolute zero in finite processes since it is inaccessible. It is only possible to approach it but never reach absolute zero.

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A reaction that requires energy or work from surroundings in order to proceed.

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A reaction that can proceed without external input of work.

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Heat released or absorbed at a constant pressure.

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State of entropy of the entire universe, as an isolated system, will always increase over time and never decrease.

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Related to the law of conservation of energy, in which energy can neither be created nor destroyed; energy can only be transferred or changed from one form to another.

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A process that cannot return both the system and the surroundings to their initial state.

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A system that comes back to its initial state and may have infinite changes.

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System: object of study
Surrounding:  interacts with the system

For example:
Closed: there is an interchange of energy but no matter
Open: interchange of both energy and matter among system and surrounding

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Property whose initial state does not depend on the path taken to reach that specific value (a final state).

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Energy transferred from a system to its surrounding

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Energy that determines the amount of work a system can do.

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the amount of thermal energy that is not used in useful work, that is measured by the disorder in the system. Degree of chaos in a system.