Common solid alcohol in hot pot restaurants

Why is the solid alcohol commonly found in hot pot restaurants in a solid state?

I don't know if anyone has ever been curious

Some are at the bottom of the hot pot

What are the burning blue crystals?

The answer is of course - solid alcohol!

We all know that alcohol is in liquid form, but why is solid alcohol, a common fuel in hot pot restaurants, solid?

The reason is that some curing agents are added to the liquid alcohol.

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