Detailed Instructions: Given a scientific passage and an answer, generate a question for the given answer.
Q: Passage: Compressibility is the measure of how much a given volume of matter decreases when placed under pressure. If we put pressure on a solid or a liquid, there is essentially no change in volume. The atoms, ions, or molecules that make up the solid or liquid are very close together. There is no space between the individual particles, so they cannot pack together. Answer: compressibility
A:
The measure of how much a given volume of matter decreases when placed under pressure is called?