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Boiling water contains only a specific amount of heat energy required for it to boil. On the other hand, as steam is formed from boiling water, it contains the heat energy of boiling water, along with the heat of vaporization due to phase change. Thus, as steam has more heat energy, it can cause more severe burns than boiling water. Hope this helps!
The best way to understand this is by looking at an energy diagram as water goes from solid to gas. During vaporization, you can see that there is a plateau during 100C as liquid water must convert into water. The energy of water only increases once it gets into the gaseous form.
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