When it turns into a solid, the liquid will contain the same 30 billion particles.
We can arrive at this answer because:
Based on this, we can say that if a liquid substance contains 30 million particles and turns into a solid substance, the 30 million particles will be kept, but the arrangement between them will be modified.
In a solid substance, the particles will form a stable arrangement, with little space between them and without the possibility of movement between them.
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