In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.

[Q]: Question: Expansion of a gas into a vacuum is irreversible because the external pressure is measurably less than the internal pressure of the gas, and no states of what exist? Answer: equilibrium
[A]: Expansion of a gas into a vacuum is irreversible because the external pressure is measurably less than the internal pressure of the gas, and no states of equilibrium exist.


[Q]: Question: What are structures that protect the coast like barrier islands called? Answer: breakwaters
[A]: Structures that protect the coast like barrier islands are called breakwaters.


[Q]: Question: What two types of atoms bond to form sulfate minerals? Answer: oxygen and sulfur
[A]:
Oxygen and sulfur two types of atoms bond to form sulfate minerals.