Search found 158 matches

by Himself
Fri Apr 21, 2017 1:57 pm UTC
Forum: Science
Topic: Safe electrolytes for electrolysis.
Replies: 14
Views: 4469

Re: Safe electrolytes for electrolysis.

I'll try the magnesium hydroxide and see how that works.
by Himself
Thu Apr 20, 2017 2:57 pm UTC
Forum: Science
Topic: Safe electrolytes for electrolysis.
Replies: 14
Views: 4469

Re: Safe electrolytes for electrolysis.

Even given the low solubility of magnesium hydroxide? Though I see the appeal of limiting what anions are present.
by Himself
Thu Apr 20, 2017 1:42 pm UTC
Forum: Science
Topic: Safe electrolytes for electrolysis.
Replies: 14
Views: 4469

Re: Safe electrolytes for electrolysis.

I wasn't sure about SO 2 . I had read somewhere that sulfuric acid was commonly made by oxidizing SO 2 to SO 3 , so I guess I was concerned about that reversing. I'm not concerned about magnesium hydroxide considering it is used as an over the counter antacid. I was even considering using it as a bu...
by Himself
Wed Apr 19, 2017 5:20 pm UTC
Forum: Science
Topic: Safe electrolytes for electrolysis.
Replies: 14
Views: 4469

Re: Safe electrolytes for electrolysis.

I expect the CO2 would form around the anode.
2H2O --> O2 + 4H+ + 4e-
So the pH around the anode would drop.

What of magnesium sulfate, then? It could release SO2 or form small amounts of sulfuric acid or magnesium bisulfate I imagine.
by Himself
Wed Apr 19, 2017 1:33 pm UTC
Forum: Science
Topic: Safe electrolytes for electrolysis.
Replies: 14
Views: 4469

Re: Safe electrolytes for electrolysis.

I was thinking of wiring up parallel batteries anyway. I had thought of using sodium bicarbonate as well, but I am wasn't sure if I might get adverse reactions from the anion such as reduction to CO or something like that, though that might not be a problem if the area is well ventilated.
by Himself
Wed Apr 19, 2017 3:42 am UTC
Forum: Science
Topic: Safe electrolytes for electrolysis.
Replies: 14
Views: 4469

Re: Safe electrolytes for electrolysis.

So would common batteries in distilled provide enough voltage for distilled water without being painstakingly slow?
by Himself
Tue Apr 18, 2017 1:19 am UTC
Forum: Science
Topic: Safe electrolytes for electrolysis.
Replies: 14
Views: 4469

Safe electrolytes for electrolysis.

I am interested in producing hydrogen gas but I would like to minimize the hazardous materials I would have to deal with. My main concern is what electrolyte I could use without having to worry about hazardous byproducts. Sodium chloride is out because, as I understand, it would likely yield some ch...
by Himself
Mon Jul 04, 2016 1:58 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1702: "Home Itch Remedies"
Replies: 33
Views: 6937

Re: Home Itch Remedies

What of scalding hot water?
by Himself
Wed Jun 29, 2016 7:20 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1700: "New Bug"
Replies: 30
Views: 8717

Re: 1700: "New Bug"

Yeah though given the theme of late it would be interesting if this guy's inept programming would lead to insects infesting his computer.
by Himself
Wed Jun 29, 2016 1:03 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1700: "New Bug"
Replies: 30
Views: 8717

Re: 1700: "New Bug"

For a moment I thought the punchline would be that the bug was an actual insect.
by Himself
Mon May 23, 2016 9:35 pm UTC
Forum: What If?
Topic: What-If 0150: "Tatooine Rainbow"
Replies: 52
Views: 44807

Re: What-If 0150: Tatooine Rainbow

Intrabinary seems to make sense to me as well since such a planet would be within the binary system and would be dominated by the one star it does orbit.
by Himself
Mon May 16, 2016 10:36 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1681: "Laser Products"
Replies: 30
Views: 7991

Re: 1681: "Laser Products"

Isn't laser jet removal already in development?
by Himself
Fri May 13, 2016 3:12 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1680: "Black Hole"
Replies: 31
Views: 8018

Re: 1680: "Black Hole"

I'd be worried about the micromicroquasar that would result from placing it in Earth's atmosphere.
by Himself
Wed May 04, 2016 10:55 pm UTC
Forum: Science
Topic: Does potential energy have mass?
Replies: 78
Views: 15873

Re: Does potential energy have mass?

Sorry, I had meant to say increases, not diminishes.
by Himself
Wed May 04, 2016 10:04 pm UTC
Forum: Science
Topic: Does potential energy have mass?
Replies: 78
Views: 15873

Re: Does potential energy have mass?

I was using the formula U=-gMm/r, directly, not any logarithm. Using a 1 kg mass and a 4 million solar mass black hole I get: ~-2*10^6 J at 25 k light years ~-6*10^10 J at 1 light year ~-4*10^15 J at 1 AU So the potential energy diminishes rapidly with increasing distance at close proximity and more...
by Himself
Wed May 04, 2016 12:29 am UTC
Forum: Science
Topic: Does potential energy have mass?
Replies: 78
Views: 15873

Re: Does potential energy have mass?

I was under the impression that the potential energy increased with distance with U=-GMm/r simply giving negative values. I understand, for example, that the majority of the ~25k light years between us and Sagittarius A* accounts for a very small portion of our potential energy relative to it, but w...
by Himself
Mon May 02, 2016 10:08 pm UTC
Forum: Science
Topic: Does potential energy have mass?
Replies: 78
Views: 15873

Re: Does potential energy have mass?

So here's where I'm confused. I have read in a few places that the energy radiated by a quasar is equivalent to a significant portion of the mass of the infalling material. All of that must have originally been gravitational potential energy. But that material would still have gravitational potentia...
by Himself
Mon May 02, 2016 1:11 am UTC
Forum: Science
Topic: Bad science jokes!
Replies: 100
Views: 36492

Re: Bad science jokes!

My friend showed me his granite counter top. It was really gneiss.
by Himself
Sun May 01, 2016 2:34 am UTC
Forum: Science
Topic: Does potential energy have mass?
Replies: 78
Views: 15873

Re: Does potential energy have mass?

The scenario of the rocks falling inward is still relevant to reality, though, right? The radiation from quasars ultimately comes from gravitational potential energy, doesn't it?
by Himself
Sun Mar 20, 2016 2:24 am UTC
Forum: Site/Forum issues
Topic: Let's Point and Laugh at Those Who Don't Read Announcements
Replies: 2
Views: 4006

Let's Point and Laugh at Those Who Don't Read Announcements

I have not been on the forum for a while and while going over one post I noticed some strange text substitutions. Among other things "What if" is displayed as as "Remember when" and seemingly random words are rendered as "six." It doesn't seem to affect other sites, so ...
by Himself
Sun Jul 05, 2015 5:26 am UTC
Forum: Science
Topic: Challenge: Create a living machine
Replies: 15
Views: 4361

Re: Challenge: Create a living machine

I guess I'm resurrecting this, but would the Replicators from Stargate count?
by Himself
Wed Apr 29, 2015 3:08 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1518: "Typical Morning Routine"
Replies: 126
Views: 19131

Re: 1518: "Typical Morning Routine"

I see a surprising amount of people with floor vents in this thread. They are actually rare in construction for obvious reasons. Given the people who have mentioned they did not know there were homes with floor vents, it seems this thread would naturally attract such comments. Though I think you're...
by Himself
Wed Apr 15, 2015 4:33 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1512:"Horoscopes"
Replies: 43
Views: 9443

Re: 1512:"Horoscopes"

If you're born 9 months before you're conceived, do you age backwards?
by Himself
Wed Feb 25, 2015 5:29 pm UTC
Forum: Science
Topic: Living in a earth-like moon orbiting a planet
Replies: 58
Views: 25391

Re: Living in a earth-like moon orbiting a planet

Another thing I've been thinking of in regard to atmosphere is the atmospheric circulation of Beta. Since we are talking about an object with the same mass, radius, and rotation as Earth, it seems likely that it would have similar wind belts. In other words, the atmosphere would be largely dominated...
by Himself
Wed Feb 25, 2015 6:06 am UTC
Forum: Science
Topic: Living in a earth-like moon orbiting a planet
Replies: 58
Views: 25391

Re: Living in a earth-like moon orbiting a planet

As far as the appearance of the eclipse goes, I suspect the darkness might not even be complete, since we'd get refraction/scattering through Alpha's atmosphere.
by Himself
Tue Feb 24, 2015 1:25 am UTC
Forum: Science
Topic: Teleporting inside a wall
Replies: 16
Views: 5299

Re: Teleporting inside a wall

Not sure if my back-of the envelope calculations were right, but it seems energy due to electrostatic nuclei would actually be quite small. On the order of 0.1J if we consider nuclei that end up within 10 pm of each other. Someone may want to check that, though.
by Himself
Fri Feb 20, 2015 9:03 pm UTC
Forum: Science
Topic: Teleporting inside a wall
Replies: 16
Views: 5299

Re: Teleporting inside a wall

What is the difference between teleporting someone into a wall and teleporting them into air? There is still a random distribution of atoms, chances are good there is overlap in either case. The difference of a few atoms overlapping vs billions doesn't seem to matter when we're talking nuclear fusi...
by Himself
Fri Feb 20, 2015 7:25 pm UTC
Forum: Science
Topic: Teleporting inside a wall
Replies: 16
Views: 5299

Teleporting inside a wall

For a bit of time now the idea has been bouncing around of what would happen if someone were to teleport inside a wall. Let's ignore how the teleportation would take place. I've only seen or read of this happening in a couple scifi/fantasy scenarios, which have either result in some unfortunate pers...
by Himself
Sat Nov 22, 2014 6:07 am UTC
Forum: What If?
Topic: What-If 0120: "Alternate Universe What Ifs"
Replies: 94
Views: 42610

Re: What-If 0120: "Alternate Universe What Ifs"

Regarding scuba divining human blood. Randall talks about having to account for differences in density, but what about differences in viscosity? Could that affect anything?
Getting a bit of a Cave Johnson vibe here.
by Himself
Mon Nov 03, 2014 8:36 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1442: "Chemistry"
Replies: 63
Views: 21819

Re: 1442: "Chemistry"

Under sufficient pressure, though, couldn't oxygen link together with itself into chains? We have to consider the implications of elements with closed loops.
by Himself
Wed Oct 29, 2014 9:24 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1440: Geese
Replies: 52
Views: 12073

Re: 1440: Geese

Jumping to that topic again: are the objects, that are visible to the naked eye in the night sky, only stars (within a few hundred lightyears) or are there also vast galaxies (millions of lightyears away, like the image above reads, but not actually a star) that show up as a bright dot? Galaxies lo...
by Himself
Wed Oct 29, 2014 8:32 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1440: Geese
Replies: 52
Views: 12073

Re: 1440: Geese

Yes. That misconception is a bit of a pet peeve. Kinda funny that, given how big the universe is, that people would actually over estimate the distance between things. Actually, I have another theory about that. What if their sense of distance isn't off, having quite accurately grasped that the dis...
by Himself
Wed Oct 29, 2014 4:49 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1440: Geese
Replies: 52
Views: 12073

Re: 1440: Geese

Yes. That misconception is a bit of a pet peeve. Kinda funny that, given how big the universe is, that people would actually overestimate the distance between things.
by Himself
Fri Jun 27, 2014 4:30 am UTC
Forum: Science
Topic: Slowing toward terminal velocity
Replies: 1
Views: 1431

Slowing toward terminal velocity

I am doing some work involving objects in freefall and am trying to find an equation for how an object would slow after entering a medium where it has a much lower terminal velocity, specifically water. Say, for example, I have an object with a terminal velocity in water of 2 m/s striking the surfac...
by Himself
Thu May 15, 2014 4:14 am UTC
Forum: What If?
Topic: What-If 0096: "$2 Undecillion Lawsuit"
Replies: 65
Views: 20104

Re: What-If 0096: "$2 Undecillion Lawsuit"

If I did my calculations right, the sphere of pennies would still by larger than its Schwarzschild radius, but I figure the result would still be a black hole.
by Himself
Thu Feb 20, 2014 3:24 pm UTC
Forum: What If?
Topic: What-If 0084: "Paint the Earth"
Replies: 47
Views: 19208

Re: What-If 0084: "Paint the Earth"

Moose Anus wrote:
alanbbent wrote:Fine. I'll ask. What's the movie title that gets rounded to T10N?
My guess is Se7en.

Shouldn't that be Ii10ii, then?
by Himself
Fri Jan 31, 2014 10:11 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1324:"Weather"
Replies: 76
Views: 18716

Re: 1324:"Weather"

moody7277 wrote:
Himself wrote:I'd be freaking out too if there was a forecast of 960 mbar. That is insane.


Indeed. IIRC, 960 miilibars is tropical storm kind of pressure.

960 millibars is equivalent to a category 2-3 hurricane, actually. Lowest pressure recorded for a land-based system in the US is 953 mb.
by Himself
Fri Jan 31, 2014 2:33 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1324:"Weather"
Replies: 76
Views: 18716

Re: 1324:"Weather"

I'd be freaking out too if there was a forecast of 960 mbar. That is insane.
by Himself
Wed Jan 15, 2014 4:40 am UTC
Forum: What If?
Topic: What-if 0079: "Lake Tea"
Replies: 59
Views: 17730

Re: What-if# 0079: Lake Tea

Am I the only one wondering if Randall tried to pull a fast one on us with the amount of energy in a bottle full of anti-matter? Does he mean a bottle full of anti-H 2 O? Matter is a little generic, anti-lead would have a different amount of energy than anti-hydrogen I would think. Where does the 6...
by Himself
Tue Jan 14, 2014 11:49 pm UTC
Forum: What If?
Topic: What-if 0079: "Lake Tea"
Replies: 59
Views: 17730

Re: What-if# 0079: Lake Tea

Am I the only one wondering if Randall tried to pull a fast one on us with the amount of energy in a bottle full of anti-matter? Does he mean a bottle full of anti-H 2 O? Matter is a little generic, anti-lead would have a different amount of energy than anti-hydrogen I would think. Where does the 6...

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