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Designing Earth-like Atmospheres

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Download the SPREADSHEET: docs.google.com/spreadsheets/d/1cW7BIWlBUscqS9MVqs5gSbPH0OGzyE-j2cz6ADBSVzE/edit?usp=sharing
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► PRESSURE CHART: www.projectrho.com/public_html/rocket/images/worldbuilding/atmograph04.jpg
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May 7, 2018

ArtfexianworldbuildingconlangingAtmospheresEarths atmosphereAtmospheres explainedStructure of Earths AtmospherePlanetsAtmospheric PressureAtmospheric densityAtmospheric composition

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Comments 431
J.T. Davis
J.T. Davis 4 days ago
How do you determine the temperature of your planet? Does it have to do with the luminosity of your star, or do you put in what you want the avg temp of your planet to be and hope that such a temperature permisses a habitable atmosphere?
Emanuel Correia
Emanuel Correia 20 days ago
I thought oxygen is bad for you, I wouldn't want to live in a world with an oxygen pressure of more than 0.3 atm
Le Daverix
Le Daverix Month ago
chapeau
hanks40cents
hanks40cents Month ago
Is also of note the implications, that that would have on cooking, as in a higher pressure the boiling point of water is going to be higher. In a 1,7 atm the boiling point would be at around 115°C (for comparison, a pressure cooker cooks at approximately 2 atm at 121°C). So anything cooked or steamed would cook in less time. Saunas would have to be drier or you would risk death, or they would only be possible at high altitudes. In low pressures on the other hand, pressure cookers could have developed earlier, or the cuisine could have been more filled with grilled, broiled and fried foods.
Gabriel Meyer
Gabriel Meyer Month ago
Darn, I made a whole system and everything, and then I find out that I need 5x Earth's greenhouse effect just to get it habitable, Darn
tiezukae
tiezukae 2 months ago
*has aneurysm*
Xeno Shvetsario
Xeno Shvetsario 3 months ago
6:04 How did you figure that out? I don't get how you're supposed to convert the habitable atm into those habitable distances below and above sea level.
abdamit
abdamit 3 months ago
I love this kind of shit.
T M Suhanthan
T M Suhanthan 3 months ago
I TRIED IT AND MY OXYGEN LEVEL CAME 0.44 ATM
KelixKatzGaming
KelixKatzGaming 3 months ago
4:31 death by twitching? how?
LeviaRiosh
LeviaRiosh 4 months ago
If I put laughing gas, would I get giggling creachures?
iiKyanite
iiKyanite 5 months ago
How the hell do I get temperature of my planet xD
Azazel
Azazel 6 months ago
If I built a world I would make the plants use retinal (I think that's the name) instead of chlorophyll for photosynthesis so the planet would be purple instead of green.
Hating Mirror
Hating Mirror 6 months ago
Argon is a gas on it's own, it doesn't consist of other gases Amino acids are created of mineral nitrogen, N2 in the air is just a good common gas that doesn't react with things much
Parthian Capitalist
Parthian Capitalist 7 months ago
4:59 California world it is!
Thomas Duursma
Thomas Duursma 7 months ago
O2, N2, etc.... you can remember it with the following shorthand H-BrONClIF = H2 Br2 O2 N2 Cl2 I2 F2!
Peter Smythe
Peter Smythe 7 months ago
One thing you didn't mention, but probably should have, is vapor pressure of volatiles like water. That creates a lot of interesting effects and also some really dangerous ones like the potential for needing a pressure suit, or for that matter the atmosphere homogenizing above a certain altitude. Or there being mesospheric mountains that stretch into realms where water cannot exist as a liquid at background temperature.
Peter Smythe
Peter Smythe 7 months ago
"High Oxygen worlds are really fun." Maybe in the Dwarf fortress version of the word fun...
Peter Smythe
Peter Smythe 7 months ago
Let's see... 80 atmospheres of Helium, 5 Atmospheres of Neon, 2 atmospheres of N2, and half an atmosphere of O2. Plus a bit of Argon. Who says we can't build unpressurized surface structures on Venus?
brachypelmasmith
brachypelmasmith 7 months ago
retinal detachment? Uff.
Emeraldstar_14
Emeraldstar_14 8 months ago
I might make a high-density air world, but gravity is already low (0.9🌏) and the world is full of dragons. But I guess with their large size, flight will be easier
Dead Knight
Dead Knight 8 months ago
Can I get the partial atmospheric pressures by multiplying the atm of my world's sea-level by the percentage of the gas? No matter which file I download the spreadsheet as, I can't use it.
Speedbun
Speedbun 9 months ago
Alright, but I *can* have a lot of krypton in the atmosphere? I just want the inhabitants to have ridiculously deep voices.
quakerdevil08
quakerdevil08 9 months ago
How did you calculate the habitable ranges in the spreadsheet? It appears your values in the Partial Pressure column changed while mine did not. Help please and thank you! :)
Ethan Niles
Ethan Niles 10 months ago
I want to create a world at 0.2 Earth radii but 1 G gravity, but apparently it says it has 0.5 Earth’s escape velocity, meaning that barely anything can hang around in the atmosphere, how do I fix it?
Ethan Niles
Ethan Niles 9 months ago
But could I still have a ~sea level atmosphere, because I want living things on it, besides I want it to also have a flatter topography with shorter mountains. I also put in a low scale height so the atmosphere does not go up all that high anyway, it has a Karman line of 20km compared to Earth’s 100km
Tiler
Tiler 9 months ago
The escape velocity is determined by the gravitational influence your planet has, which is directly related to its mass. If you want a planet with a higher escape velocity, you need either a bigger planet, or a denser planet. Your planet may be 1G at sea level, but it would taper off to 0 much more quickly than it would on a more massive planet, hence, less energy is required to escape
Grim The Ghastly
Grim The Ghastly 10 months ago
What equation did you use to find the habitable elevation range?
Joao Paulo Teixeira Pereira
Artifexian I have a question!! Help Please! Whenever I change the Atmospheric Pressure at Altitude, the values of the gases won´t change (when you put -1000m the CO2 was at 0,01916) but when I changed and put below 1km everything stayed the same :/ I think the 0,01916 only depends of the Atmospheric Pressure at Sea Level and the % of the Atmospheric Composition. Therefore, why did your numbers changed?
Corey Reid
Corey Reid 10 months ago
It means they got Vulcan almost right, re: humanoid life forms. The canon for prime Vulcan has a lesser oxygen content and lesser air density. It meant that Vulcans at baseline were "normal" but on Earth had better hearing and better stamina, and in females heightened sense of smell. It also explains why the Animated Series might have other fauna wrong: animals may not be as large as on Earth, and Vulcans probably could not live in lowlands because of the toxicity of the air (something "Enterprise" got right, oddly enough.)
Mithrax
Mithrax 10 months ago
I watched 2 videos now without reading descriptions and all that stuff... I have no clue what this channel is about. But I like it very much.
LemonGuy
LemonGuy 11 months ago
What if you increase the amount of neon to 1.5%? How freaking cool would the sky look during a thunderstorm (red flashes in the clouds at every lighting strike)
V�ctor Alemany P�rez
Just amazing
Maarten van Duijvenvoorde
Hmmm I made up a world where the mountains are around 16K high and habitable, but at 0m it also needs to be habitable. I wonder if this is feasible. Thanks for the tool, I'll see if I can make it work
shaun03a
shaun03a Year ago
earth during the carboniferous period sounds like actual hell
Pulse
Pulse Year ago
so let me get this right the chanel is about making your own fantasys world work with maths like. lol
Indecisive
Indecisive Year ago
I'm doing some donut planet stuff and I was looking for other ways to spice it up. I think I'll make it so the inner equitorial societies have achieved human flight to some extent. Storms will be nasty, but they are bound to have some cool caves and stuff with all those mountains. I was also looking for a way to start conflict in this story, so if the main character is out flying and gets caught in an unforeseen storm, I could totally make a story out of that.
J's Music
J's Music Year ago
How did you call when something would be poisonous???
Razorback1,
Razorback1, Year ago
Actualy most of earths hidrogen stayed with Earth . Before oxogen arrived , thus why Earth has water
Michael Carter
Wow! One of my worlds has bigger animals and more thunderstorms. Cool to know that there's a good reason!
Wiggle Oliver
Wiggle Oliver Year ago
You should make an app of your spreadsheets
TreeTheEnderHyena
What if the creatures on said planet didn't breath oxygen?
Adam Fisher
Adam Fisher Year ago
Are you going to talk about society and politics
Daniel Rossy
Daniel Rossy Year ago
2 recommendations: when you convert units on the fly (psi to atm in this case) I get confused. It would be nice if you include some converters in your spreadsheets. I would also like this for the comparison with Earth Values. The Second recommendation is about the state of the spreadsheets. When I download them, they appear with the values you'd set in the video. I think that the "pristine" state of the spreadsheets should be "all inputs set to 0".
Σeegma
Σeegma Year ago
1:39 "rule of thumb"
Sabersonic
Sabersonic Year ago
Apologies for the belated comment, got distracted. As always, GURPS Space 3rd Edition barely even mentions such creative variety, especially in the altitude and composition of the atmosphere or at least the consequences of such variables outside of "your character takes this kind of damage if exposed". The altitude one and the atmospheric pressure intrigues me the most such as your two examples of CO2 valleys and habitable mountains vs wearing a space suit to climb a mountain. It certainly gives some creative ideas when it comes to extrasolar colonization. Either way, thanks for the inspiration Edgar.
aggese
aggese Year ago
impressive
Daniel Rossy
Daniel Rossy Year ago
Could you share or point to the place where I can get the graph you shown at 3:36?
garrondumont
garrondumont Year ago
On your planet, considering human flight might be possible in the right circumstances is it possible that the lowlands could act as a toxic sea that people "sail" on?
Blocky Universe Productions
Whatever happened to Oa?
Yehia Falcon
Yehia Falcon Year ago
So uhhhhh, u Taking a break?
ElTagno
ElTagno Year ago
I love your accent. Where abouts in Scotland are you from?
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