Dont you notice that when you put soup on the stove it starts to bubble up as it gets hotter? the soup gets hotter and bubbles because it hits it boiling point. when something hits its boiling point it can bubble.the bubbles come from when the heat give of to the soup it creates expanded molecules. the "bubbles" are expanded and also because its turning into steam.any type of liquid can bubble. when the liquid reaches 212 degrees Fahrenheit it starts to bubble and also starts to rise.
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