This is a pan with water being heating by a gas flame. The pan is made of iron metal and the grey balls are iron particles. The blue balls are water particles.
You can not see particles because they are to small to be seen.
The gas flame heats up the iron particles witch heat up the water particles witch makes them shake and when its hot enough the water particles will turn in to water vapour. This is the particles moving apart
So when heat is appeled to the pan form the fire the water particles heat up and they evaporate.
Thank you for watching the heat to water via pan Done by Harrison and James