Phase Change Diagram of Water

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Manu Vohra 1L
Posts: 61
Joined: Wed Oct 03, 2018 12:15 am

Phase Change Diagram of Water

Postby Manu Vohra 1L » Thu Feb 14, 2019 4:45 pm

Why does steam at 100oC burn more than water at 100oC?

Heesu_Kim_1F
Posts: 60
Joined: Fri Sep 28, 2018 12:18 am

Re: Phase Change Diagram of Water

Postby Heesu_Kim_1F » Thu Feb 14, 2019 5:42 pm

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!

Jessica Chen 1F
Posts: 61
Joined: Fri Sep 28, 2018 12:17 am

Re: Phase Change Diagram of Water

Postby Jessica Chen 1F » Thu Feb 14, 2019 6:14 pm

The heat of vaporization is a lot larger than the heat of fusion (40 kJ vs 334 J) so when steam condenses back into water, it releases all 40 kJ into the skin, which creates more severe burns.

Kenan Kherallah 2C
Posts: 78
Joined: Fri Sep 28, 2018 12:17 am

Re: Phase Change Diagram of Water

Postby Kenan Kherallah 2C » Thu Feb 14, 2019 6:25 pm

Because steam has to go through a phase transition while water doesn't as well as the fact that the enthalpy of condensation is very high, so more energy is released

Nicolette_Canlian_2L
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Joined: Fri Sep 28, 2018 12:25 am
Been upvoted: 1 time

Re: Phase Change Diagram of Water

Postby Nicolette_Canlian_2L » Thu Feb 14, 2019 10:50 pm

additional energy is required to change water from its boiling point to steam. Extra heat will cause the boiled water to reach vapor and burn more.

Raj_Bains_2C
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Re: Phase Change Diagram of Water

Postby Raj_Bains_2C » Thu Feb 14, 2019 10:51 pm

Steam at 100 C contains more heat than water at 100 C because heat goes into breaking intermolecular bonds.

Andre_Galenchik_2L
Posts: 69
Joined: Fri Sep 28, 2018 12:23 am

Re: Phase Change Diagram of Water

Postby Andre_Galenchik_2L » Thu Feb 14, 2019 11:06 pm

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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