When the water reaches its boiling point bubbles start to form near the bottom of your pan because the bottom is closer to the heat source.
Ceramic pot making noise.
It s a rather chaotic process and usually loud.
The effect in the top picture was accomplished by melting and fusing glass on the pot.
If you do this it can actually make the pot explode so always be careful.
Every 15 mins to an hour they make a high pitched ping type of noise.
The mixture of temperatures causes stress on the pot.
Inside these bubbles are water vapor which rises to the top and pops.
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That is the material had many defects in it s structure like the ones described in this wiki page and the heat from the water gave the structure enough energy to relax and heal them i ve witnessed a ceramic cup that started to make bell like noises when i poured myself a tea in it an.
I am new to wheel thrown pottery.
The odd thing is.
I make sound fx for people to use in their projects.
I m not sure but it s possible that the ceramic material was relieving stress.
For more about firing glass with pottery visit combining glass with pottery.
I have 2 beautiful bowls that came out of the kiln several days ago.