Steam resulting in burns?

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Steam resulting in burns?

Postby 805132275 » Sun Feb 03, 2019 1:54 pm

Dr. Lavelle thoroughly explained why steam burns more than ___? I was absent that day and was wondering if someone could thoroughly explain the conceptual basis of that discussion?

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Joined: Fri Sep 28, 2018 12:25 am

Re: Steam resulting in burns?

Postby 405161024 » Sun Feb 03, 2019 2:08 pm

water vapor burns more than water at 100 degrees celsius (boiling temperature) because a lot of energy is needed to break the intermolecular bonds between the water molecules so that the water is vaporized. This means that when it came in contact with your skin it would release all that extra energy (heat) and cause a worse burn than water at 100 degrees.

Irene Zhou 1E
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Re: Steam resulting in burns?

Postby Irene Zhou 1E » Sun Feb 03, 2019 2:11 pm

Steam at 100 degrees releases a lot more heat and energy than boiling water at 100 degrees so it would be much more painful and harmful

Arta Kasaeian 2C
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Re: Steam resulting in burns?

Postby Arta Kasaeian 2C » Sun Feb 03, 2019 2:13 pm

His reasoning was that although both burns are caused by our bodies absorbing the heat of the substance until reaching our body temperature, the heat transferred by boiling water on accounts for the temperature change from 100 degrees celsius to whatever final temperature, while the heat change in absorbing vapor consists of the heat required to change states from gaseous state to 100 degree liquid state, and then the heat needed to change temperature from 100 to lower final temperature.

Jennifer Su 2L
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Re: Steam resulting in burns?

Postby Jennifer Su 2L » Sun Feb 03, 2019 2:14 pm

Steam burns causes more severe burns than water burns.

This is because heat is required during melting or boiling (phase transition), and therefore the temperature of the sample REMAINS CONSTANT even though heat is being supplied. When you get burned by water, since it is not in a phase transition, the heat being transferred to your skin will cool down the water relatively quickly. However, when you get burned by steam, it needs to transition from vapor phase to liquid phase (condensation). To do so, the steam will have to cool down all the way to liquid vaporizing state, and will remain at 100 C (which is the liquid vaporizing point for water) at a longer period of time than liquid water. Therefore, steam burns will transfer more energy/heat to your skin as it must release more heat/energy in order to cool down.

Ronald Thompson 1F
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Re: Steam resulting in burns?

Postby Ronald Thompson 1F » Sun Feb 03, 2019 2:25 pm

Steam at 100 degrees gives off a lot more heat, thus burns more. There is a chart in the textbook that explains it much better

Edward Suarez 1I
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Re: Steam resulting in burns?

Postby Edward Suarez 1I » Sun Feb 03, 2019 3:11 pm

when steam makes contact . w/ skin, it undergoes phase transition into liquid . which releases the amount of energy (~41 kJ) for the phase transition into ur skin as heat or something like that

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