Latent Heat Vaporization of Water

[Assaltwaffle]

To be frank, our value is wrong. I'm not sure if the original source measured in Kilojoules or something, but the Latent Heat Vaporization of Water is 2,264,705 joules/kg.

Wikipedia lists it as such and here is a scientific journal citing the same. While the full article isn't visible, luckily for us the value we need is. Note that their value is in kilojoules, so multiply it by 1000.

Also, just look at our chart as-is. The second lowest is Nitrogen, a basic element that sitting at just over 200,000. Why would water require 100x less energy when it is a much more substantial molecule? It wouldn't.

 

[DarkDragonMedeus]

Our value is based on Joules per cc, not Joules per kg iirc. A single kg of water is 1003.00902708 cc

 

[Assaltwaffle]

Our values are cited as J/Kg, as per the key below the chart.

 

[DarkDragonMedeus]

I see, I usually refer to the bulleted lists where it says this on the Calculations page.

• Vaporization of water: 2575 J/cm^3

But I guess the below chart is inaccurate regardless.

 

[Assaltwaffle]

Yeah the chart itself needs an updated value.

 

[KLOL506]

So, does anything get changed by this? Other than the vaping of humans? And the values of Water, Nitrogen and the like?

 

[Assaltwaffle]

Nothing is changed at all so long as the incorrect value wasn't used. If it was...

 

[KLOL506]

Apparently the value used was 4.178 kJ/kilogram.

Though latent heat wasn't used for this.

 

[Assaltwaffle]

He used specific heat there, which is correct.

 

[KLOL506]

'Kay.

 

[Assaltwaffle]

Actually looking at his calc he didn't account for Latent Heat Vaporization at all, so that calc is actually lowballed.

 

[KLOL506]

Woah. That changes the ball-game altogether.

Calc belongs to FanOfRPGs BTW, Spino just compiled the calcs in one page for easier navigation.

BTW, how would we figure out in a franchise whether specific heat and latent heat is used? Any visibly-distinguishable difference we can spot?

 

[DarkDragonMedeus]

It would still be in the 9-A range right?

 

[KLOL506]

It would still be in the 9-A range right?

We'll have to figure out the latent heat vaporization values of other materials first to figure it out.

 

[AguilaR101]

Both values are used together to measure vaporization you just add them up.

 

[Assaltwaffle]

@AguilaR

Yes but for the calc he specifically says "The values taken were simplest and closest analogs, plus this calculation did not include the latent heat." I'm not sure why he didn't decide to use this, at least for water, but the value can be higher.

 

[KLOL506]

@AguilaR
Yes but for the calc he specifically says "The values taken were simplest and closest analogs, plus this calculation did not include the latent heat." I'm not sure why he didn't decide to use this, at least for water, but the value can be higher.

So, what would the new values be?

For vaping a human, I mean?

 

[AguilaR101]

In the comments from the original calc in specific you can see someone else accounting for the latent heat, why the blog post itself wasn't updated is beyond me.

 

[DarkDragonMedeus]

By the looks of it, Latent heat for the vaporization water in a human being 208,808,919.6 Joules + (2,264,705 J/kg * 37.2 kg) = 293055945.6 Joules. Which at least ups the main calc up to 385,202,334.6 J

Now we just need latent heat for the rest of the components, but I doubt it's going to exceed 9-A.

 

[KLOL506]

Should it be usable in all cases?

 

[KLOL506]

In the comments from the original calc in specific you can see someone else accounting for the latent heat, why the blog post itself wasn't updated is beyond me.

Damn. Gonna have to check it out.

 

[KLOL506]

By the looks of it, Latent heat for the vaporization water in a human being 208,808,919.6 Joules + (2,264,705 J/kg * 37.2 kg) = 293055945.6 Joules. Which at least ups the main calc up to 385,202,334.6 J
Now we just need the rest of them, but I doubt it's going to exceed 9-A.

Not a problem. Just need to post the calc in a blog and boom.

 

[Assaltwaffle]

Glad we got some benefit out of this as well as a fix.

 

[Spinosaurus75DinosaurFan]

Should I copy this to the reference blog?

 

[DarkDragonMedeus]

It would look a little messy given Water's the only thing that would have latent heat used, but perhaps.

 

[Spinosaurus75DinosaurFan]

Well we should probably try to make the value as accurate as possible, and this is a slightly more accurate calc.

 

[KLOL506]

Bump

 

[Antvasima]

So which page needs to be updated?

In any case, feel free to ask other calc group members to comment here.

 

[KLOL506]

Water's latent heat vaporization would be changed to 2,264,705 J/kg according to what Assalt recommends.

 

[Antvasima]

Okay. That seems fine.

In which page is this currently inaccurately listed?

 

[KLOL506]

In this page.

 

[Antvasima]

Okay. That seems fine, but it is probably safest to ask some other calc group members to verify.

 

[KLOL506]

Okay. I will notify DT, Spino, Therefir and Aiden of this.

 

[Spinosaurus75DinosaurFan]

Seems fine

 

[Antvasima]

Okay. Feel free to update the page then.

 

[Antvasima]

Has the page been updated yet?

 

[KLOL506]

Has the page been updated yet?

Page is still locked.

 

[Antvasima]

I will unlock it. Tell me here when you are done.

 

[KLOL506]

I will unlock it. Tell me here when you are done.

Done.

 

[Antvasima]

Okay. Thanks. Should we close this thread?