Read the section "Why Do Phase Changes Occur?" Which sentence from the section shows WHY molecules spread out when pressure decreases?

Your answer is a just took the test

The atomic nucleus made up from protons (yellow) and neutrons (blue) and held together by nuclear forces. nuclear forces (also known as nuclear interactions or strong forces) are the forces that act between two or more nucleons. they bind protons and neutrons (“nucleons”) into atomic

Burned piece of steel wool does not gain mass. so only d could be true.