a solid becoming a liquid a gas becoming a solid a gas becoming a liquid a liquid becoming a solid
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: During which change of state do the particles of a substance move from being tightly packed together to having more freedom of movement?
Possibilities:
- a solid becoming a liquid
- a gas becoming a solid
- a gas becoming a liquid
- a liquid becoming a solid

a solid becoming a liquid