What are reversible and ir reversible

A reversible process is defined as a process in which the system and surroundings can be returned to the original conditions from the final state without producing any changes in the thermodynamics properties of the universe, if the process is reversed. The reversible process is the ideal process which never occurs, while the irreversible process is the natural process that is commonly found in nature. ... This is an irreversible process. Whereas when water evaporates, it can also be condensed in the form of rains. Irreversible processes are characterized by the flow of fluids with friction, and sliding friction between any two matters. An example of an irreversible process is electric current flow through a conductor with a resistance. An example of an irreversible process is magnetization or polarization with hysteresis.

Reversible is substance that can be reverse it's change back?

Chov

A reversible process is defined as a process in which the system and surroundings can be returned to the original conditions from the final state without producing any changes in the thermodynamics properties of the universe, if the process is reversed.

The reversible process is the ideal process which never occurs, while the irreversible process is the natural process that is commonly found in nature. ... This is an irreversible process. Whereas when water evaporates, it can also be condensed in the form of rains.

Irreversible processes are characterized by the flow of fluids with friction, and sliding friction between any two matters. An example of an irreversible process is electric current flow through a conductor with a resistance. An example of an irreversible process is magnetization or polarization with hysteresis.