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This can be seen on the phase change chart during lecture. So boiling water heats up to a high temperature but it is still in liquid phase. The water vapor has to go through a phase change to turn into a gas gaining more energy/temperature into causing it to burn more than boiling water
When you are burned by water vapor, the vapor has to go through a phase transition to turn from vapor to liquid. The vapor releases energy as it cools down to the liquid state. When you are burned by boiling water, it does not change phases. Because the water vapor has has a phase transition, it will transfer more energy as heat to your skin before it cools down.
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