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Post by allie on Dec 3, 2021 1:19:24 GMT
I don't have the scientific background to calculate this myself, but given that Poseidon averages 1.3 atm at sea level and a few °C hotter:
1. Am I correct that the boiling point of point of water is a bit higher than on Earth?
2. What's the notional speed of sound at sea level on Poseidon? (Asking this mostly for technobabble reasons.)
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Post by Pawel on Dec 3, 2021 10:33:27 GMT
I don't have the scientific background to calculate this myself, but given that Poseidon averages 1.3 atm at sea level and a few °C hotter: 1. Am I correct that the boiling point of point of water is a bit higher than on Earth? 2. What's the notional speed of sound at sea level on Poseidon? (Asking this mostly for technobabble reasons.) Hopefully brains smarter than mine will pick up these questions. All I can offer using my feeble knowledge is: 1. Oh yeah, definitely. Atmospheric pressure is the main factor (along with vapor pressure, I think?) in calculating the boiling point value. 2. I had a look at the formulas for calculating speed of sound for dry air - and decided to run away and hide.  Poseidon's average mean temperature is a couple degrees higher than Earth's, so there's definitely an increase in the speed of sound - but looking at the temperature tables I think it'd be smaller than 1 m/s. But oh my goodness, all those other factors to consider - refraction and wind shear and whatnot. My brain hurts. |
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Post by doublea on Dec 3, 2021 23:35:44 GMT
Oh man what a cool question! I had to crunch the numbers because I'm a masochist like that. Looks like to make ramen on Poseidon you need to heat up your water to 107.62° C (or 225.7 F)! The most crucial takeaway from this is that soufflé may just not be an option on the waterworld. As for the speed of sound, the only factor is the temperature of air and not the pressure, since the pressure is always proportional to the density, so those don't affect the speed of sound. (I got this from www.grc.nasa.gov/WWW/k-12/airplane/sound.html), and the difference isn't much. At 16° C (60F) (Earth mean temp at the moment...) Mach 1 is 340 m/s (762mph). At 19°C (66F) mean temp on Poseidon, Mach 1 is 342m/s (766mph). I had fun learning this stuff! |
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Post by Pawel on Dec 4, 2021 8:26:06 GMT
Oh man what a cool question! I had to crunch the numbers because I'm a masochist like that. Looks like to make ramen on Poseidon you need to heat up your water to 107.62° C (or 225.7 F)! The most crucial takeaway from this is that soufflé may just not be an option on the waterworld. As for the speed of sound, the only factor is the temperature of air and not the pressure, since the pressure is always proportional to the density, so those don't affect the speed of sound. (I got this from www.grc.nasa.gov/WWW/k-12/airplane/sound.html), and the difference isn't much. At 16° C (60F) (Earth mean temp at the moment...) Mach 1 is 340 m/s (762mph). At 19°C (66F) mean temp on Poseidon, Mach 1 is 342m/s (766mph). I had fun learning this stuff! Fantastic work, Aaron! Aha, so when you said you're a machinist by trade, what you meant was masochist? And now we know two more facts about Poseidon we didn't know yesterday. This is awesome!!! Also, I'm thinking ramen for lunch, thank you very much. |
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Post by allie on Dec 5, 2021 1:10:52 GMT
The most crucial takeaway from this is that soufflé may just not be an option on the waterworld. Oh, there's a much more sinister reason I was wondering; I just haven't gotten it formatted for Undercurrents yet. (Honestly my question about the speed of sound was also for Undercurrents stuff, but apparently "this ubiquitous handgun is transonic at the muzzle on Poseidon" doesn't actually work so I'll need to find a new reason the Northwind Tricycle of weapons earned that reputation.) |
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Poseidon's average mean temperature is a couple degrees higher than Earth's, so there's definitely an increase in the speed of sound - but looking at the temperature tables I think it'd be smaller than 1 m/s. But oh my goodness, all those other factors to consider - refraction and wind shear and whatnot. My brain hurts.