How do you know when a phase change happens? At what temperature does each PCM change? How do you know? Which PCM will transfer thermal energy to the baby for the longest period of time? The shortest period of time? How do you know?

the atomic mass is the bottom number on the element.

-steel jelly

the correct answer would be b. amelia, because the particals of gas move really fast (charged particals) and gas also has a lot of room (particals move independently) so the only answer that has both of those is amelia's.