Why does steam cause burns?

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Shanzey
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Why does steam cause burns?

Postby Shanzey » Sun Jan 26, 2020 5:51 pm

I know Dr. Lavelle went into quite a bit of depth as to why steam causes burns worse than boiling water, but I am still a bit confused. Why does this occur? In my notes, I wrote that steam has a large enthalpy of condensation: is that the reason why?

Micah3J
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Re: Why does steam cause burns?

Postby Micah3J » Sun Jan 26, 2020 6:03 pm

When steam condenses onto the skin there is a large transfer of energy in the form of heat which causes the skin to burn.

Angela Wu-2H
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Re: Why does steam cause burns?

Postby Angela Wu-2H » Sun Jan 26, 2020 6:25 pm

I also believe that, through the diagram that he showed in lecture, steam is hotter than liquid because the temperature was much higher above 100 degrees, meanwhile the liquid for temperature went between 0 degrees and 100 degrees.

Petrina Kan 2I
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Re: Why does steam cause burns?

Postby Petrina Kan 2I » Sun Jan 26, 2020 6:26 pm

When steam comes into contact with skin, it encounters a phase change to a liquid and immediately releases many more kJ of energy as opposed to just boiling water which does not have to go through a phase change and therefore releases less kJ of energy.

Viviana Velasquez
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Re: Why does steam cause burns?

Postby Viviana Velasquez » Sun Jan 26, 2020 6:37 pm

He explained that because steam experiences a phase change when it comes into contact with skin, it releases a big amount of heat and therefore causes severe burns.

504939134
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Re: Why does steam cause burns?

Postby 504939134 » Sun Jan 26, 2020 6:39 pm

Steam burns more because if you look at the diagram he showed us in lecture , it releases a lot more energy to go back down to its liquid phase. The release in energy is much more than if you touched boiling hot water.

Megan Kirschner
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Re: Why does steam cause burns?

Postby Megan Kirschner » Sun Jan 26, 2020 7:07 pm

Would anyone be able to describe the diagram you all are referencing? I was sick and unfortunately missed that lecture :/

Omar Selim 1D
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Re: Why does steam cause burns?

Postby Omar Selim 1D » Sun Jan 26, 2020 7:48 pm

Steam causes burns due to the high amount of heat transferred from the steam to skin. It has a large Q and H value.

kevinolvera1j
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Re: Why does steam cause burns?

Postby kevinolvera1j » Sun Jan 26, 2020 8:41 pm

Steam is worse than water even at the same temperature when coming into contact with your skin. This is because the steam has much higher enthalpy than the water, even if they are at the same temperature. Once the steam comes into contact with your skin, it condenses and this phase change releases much more energy than the hot water which only stays a liquid.

gabbymaraziti
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Re: Why does steam cause burns?

Postby gabbymaraziti » Sun Jan 26, 2020 8:45 pm

The steam has much higher enthalpy than the liquid, because more heat is required to achieve a gaseous state. Therefore, when it comes into contact with your skin and quickly condenses, it releases a large amount of heat in comparison to that that would be released by the liquid state.

rohun2H
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Re: Why does steam cause burns?

Postby rohun2H » Sun Jan 26, 2020 9:04 pm

The diagram Lavelle showed in class was the temperature curve of water.

DHavo_1E
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Re: Why does steam cause burns?

Postby DHavo_1E » Sun Jan 26, 2020 9:32 pm

Megan Kirschner wrote:Would anyone be able to describe the diagram you all are referencing? I was sick and unfortunately missed that lecture :/


Hello,
The diagram looks like this:

https://commons.wikimedia.org/wiki/File:Water_Phase_Change_Diagram.png

J_CHEN 4I
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Re: Why does steam cause burns?

Postby J_CHEN 4I » Sun Jan 26, 2020 9:41 pm

Steam causes burns worst than water because the phase change from liquid to gases requires more energy

ASetlur_1G
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Re: Why does steam cause burns?

Postby ASetlur_1G » Sun Jan 26, 2020 10:54 pm

Omar Selim 1D wrote:Steam causes burns due to the high amount of heat transferred from the steam to skin. It has a large Q and H value.


What do the Q and H values refer to?

Shrayes Raman
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Re: Why does steam cause burns?

Postby Shrayes Raman » Sun Jan 26, 2020 11:49 pm

Steam will have to undergo phase change so it releases much more kJ of energy than liquid which doesn't phase change.

Eva Zhao 4I
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Re: Why does steam cause burns?

Postby Eva Zhao 4I » Mon Jan 27, 2020 1:08 pm

Showing the actual diagram, which is the heating curve of water, you can see that it takes a lot more energy to transition from liquid to vapor than it does from solid to liquid. Therefore, steam carries much more heat for worse burns than boiling water.

Image

Chantel_2I
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Re: Why does steam cause burns?

Postby Chantel_2I » Mon Jan 27, 2020 4:45 pm

Is there a reason why the horizontal line for vaporizing water is so much longer than the one for melting ice?

Mitchell Koss 4G
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Re: Why does steam cause burns?

Postby Mitchell Koss 4G » Mon Jan 27, 2020 10:10 pm

It takes longer for the bonds to break.

Leila_4G
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Re: Why does steam cause burns?

Postby Leila_4G » Tue Jan 28, 2020 7:56 pm

This makes me really scared of steam now!

alicechien_4F
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Re: Why does steam cause burns?

Postby alicechien_4F » Tue Jan 28, 2020 8:16 pm

Chantel_2I wrote:Is there a reason why the horizontal line for vaporizing water is so much longer than the one for melting ice?


It takes longer to vaporize water because there is a larger enthalpy, which means more heat has to be applied at a constant rate.

Areli C 1L
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Re: Why does steam cause burns?

Postby Areli C 1L » Tue Jan 28, 2020 9:28 pm

Leila_4E wrote:This makes me really scared of steam now!

Hahah, still does a great job of relaxing the body during the quarter system!

Maya Beal Dis 1D
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Re: Why does steam cause burns?

Postby Maya Beal Dis 1D » Wed Jan 29, 2020 3:37 pm

Why is the enthalpy larger? Aren't the same type of bonds being broken?

Kaylee Clarke 1G
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Re: Why does steam cause burns?

Postby Kaylee Clarke 1G » Wed Jan 29, 2020 4:31 pm

steam causes burns because there is a phase change of water as it makes contact with your skin, which causes a greater release of energy than boiling water that has a constant energy

705121606
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Re: Why does steam cause burns?

Postby 705121606 » Fri Jan 31, 2020 3:48 pm

Steam causes burns more than water because the change of phase from liquid water to water vapor requires more energy

Daniel Yu 1E
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Re: Why does steam cause burns?

Postby Daniel Yu 1E » Sat Feb 01, 2020 10:16 pm

Steam causes burns because when it comes into contact with your skin, it'll transfer its energy. It has a lot of energy since water requires lots of energy to undergo the phase change from liquid to gas.

stephaniekim2K
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Re: Why does steam cause burns?

Postby stephaniekim2K » Sat Feb 01, 2020 10:27 pm

Steam has more energy than liquid because more energy is required to transform a liquid into steam. For this reason, as steam touches the skin, much more energy is transferred, causing burns.

RobertXu_2J
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Re: Why does steam cause burns?

Postby RobertXu_2J » Sat Feb 01, 2020 10:35 pm

Steam has more energy than water, so the difference between the energy in steam and the energy of your skin is greater, and as such, when it comes into contact with you, it will transfer a correspondingly greater amount, leading to a more severe burn.

Jesse H 2L
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Re: Why does steam cause burns?

Postby Jesse H 2L » Sun Feb 02, 2020 7:28 pm

Steam has way more energy than liquid as a result of the energy required to vaporize liquid, and as a result, the phase change releases more energy onto your skin in the form of heat and burns more

Juana Abana 1G
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Re: Why does steam cause burns?

Postby Juana Abana 1G » Sun Feb 02, 2020 10:45 pm

Steam causes severe burns since it experiences a phase change and releases a big amount of heat when it comes into contact with skin

Trent Yamamoto 2J
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Re: Why does steam cause burns?

Postby Trent Yamamoto 2J » Sun Feb 02, 2020 10:46 pm

Unlike boiling water, steam experiences a phase change when it comes into contact with skin and thus releases a larger amount of heat that causes severe burns.


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