Steam

[Scrappy]

I am just wondering. I am heating up water. Evaporation point is 99.4 degrees Celsius.

My water is now 102 degrees Celsius and still no steam... Is it bug?

[Glassyfo]

Need pic

[SakuraKoi]

For some reason or another, the melting point of (polluted) ice is off by 3°C and this may also apply here so just .4°C more and you might get Steam. Not quite sure if it applies to other materials as well or if they made it inherent to water and if there are conditions (like pressure) because water is quite odd IRL but that's how it is.

[qda]

From what I've gathered, you always need a few degrees more/less than the nominal temperature of the phase change for it to happen.

Example, water will turn to steam at around 102°C, and steam will condense at around 97°C. I don't really know why, probably some choice to make phase changes easier to deal with ingame, and maybe to account for the extra energy given/received in any phase transition IRL.

[Sundance]

It's just a game mechanic to prevent the game from gettiing unplayable, because without some buffer it could evaporate and condenense hundreds of times in a second

[Yunru]

41 minutes ago, Sundance said:

It's just a game mechanic to prevent the game from gettiing unplayable, because without some buffer it could evaporate and condenense hundreds of times in a second

It's actually a real world thing too, just not with such a large difference.

[Sundance]

There's quite a bit influencing this in the real world i'm aware, i made a guess and thought he was talking about ONI tho 

[crypticorb]

35 minutes ago, Yunru said:

It's actually a real world thing too, just not with such a large difference.

In the real world, once a liquid has reached boiling point, there is a specific amount of energy required to actually force the liquid to become a gas, called the latent heat of vaporization. This energy is required to make the transition from liquid to gas, and that same amount of energy is required to be removed to condense gas.

ONI fudges the numbers by programming it to simply not transition until the water is a few degrees above the actual boiling point. You'll notice the same thing with ice not melting until it's a few degrees above the listed melting point.

Here's a fun bit of information for the curious, it gives the basics in the first few sentences with a nice graph for the enthalpy of zinc, and the energy of transition required.

https://en.wikipedia.org/wiki/Enthalpy_of_vaporization

[Sundance]

While you're not wrong, our definitions of fun may be quite different.

[Aart Bluestoke]

To be realistic you would need to put energy equal to heating the water from 100 to 122 in order to get steam at 100

[SakuraKoi]

11 hours ago, Sundance said:

it could evaporate and condenense hundreds of times in a second

no, only 5 times~ (also, your "condenese" made me hungry, it sounds like sauce or pasta~)

Seriously, I see now why the devs might indeed intentionally implemented that (they should seriously note that in the codex when clicking on temperatures or alike, Temperature itself is a DnF) and I honestly did not know. I shall simply blame Canada my natural science classes never bothering to teach that and only about boiling an egg on Mt Everest.

[crypticorb]

12 hours ago, Sundance said:

While you're not wrong, our definitions of fun may be quite different.

You're probably right. I get my dopamine pumping by optimizing stuff. I have no idea why I'm like this, but even in a game like Doom 2016, which is a purebred shoot-em-up style game, I'll still try to tweak my equipment and stuff to make it more efficient on max difficulty.

¯\_(ツ)_/¯

[KittenIsAGeek]

Yeah, I always looked at the difference as "ONI's method for accounting for the energy needed to phase change."  Since the steam itself comes out at 100c, you can boil polluted water and cool the resulting clean water down considerably using an aquatuner loop.  Although, now that PW and clean water have the same SHC, it isn't nearly as good as it used to be.  But it works.