Successful_Try543
@Successful_Try543@feddit.org
- Comment on xkcd #3135: Sea Level 1 day ago:
Thanks. I didn’t know either that there are places, where the sea level does not rise and fall twice a day.
- Comment on Do farts at least nominally increase the overall temperature of the room in which they are extruded? 5 days ago:
I’m won over on the idea that it would be outweighed by cooling effect of gas expansion from fart decompression.
Did you already find information on how much pressure a colon can sustain?
- Comment on Do farts at least nominally increase the overall temperature of the room in which they are extruded? 5 days ago:
Not much, except the pressure involved is different and flatus contains more methane, carbon oxides and fancy molecules than the air we in- and exhale usually does.
- Comment on Do farts at least nominally increase the overall temperature of the room in which they are extruded? 5 days ago:
Farts are remarkably dry.
- Comment on Do farts at least nominally increase the overall temperature of the room in which they are extruded? 5 days ago:
We are talking about mixing of gases, not the solution of a liquid in a gas or a solid in a liquid.
Here, no bonding forces are broken as there are almost none active. Air as a mixture of gases at low pressure is, at least like I have learned in thermodynamics, treated as if its different components don’t interact with each other. For each component, the state equation is evaluated individually using its partial pressure.
- Comment on Do farts at least nominally increase the overall temperature of the room in which they are extruded? 5 days ago:
Of course. Otherwise this would qualify as a chemical reaction.
I’d totally get it, if were taking about lets say vaporising of perfume or fuel. There, the bonding forces between the molecules of the liquid (van der Waals, H-bridges) are released, and thus stored energy is set free.
- Comment on Do farts at least nominally increase the overall temperature of the room in which they are extruded? 5 days ago:
Qualifies mixing of gases as dissolution?
- Comment on Do farts at least nominally increase the overall temperature of the room in which they are extruded? 5 days ago:
Exactly, beside one techniallity:
The process of fart mixing into ambient air generates heat.
No, it does not generate heat. It carries a portion of heat from the body and transports it into the ambient air in the room. Almost simultaneously, an equivalent amount of air leaves the room to the outside. The increased heat of the air yields into an increased temperature in the room.
- Comment on Is there a decent, offline Android text editor/IDE for c# programming. 6 days ago:
Xed-Editor (GitHub) (F-Droid) is an editor with syntax highlighting and can be configured wirh IDE features.
- Comment on [deleted] 1 week ago:
one might expect every child to have a body in between male and female as well
No, one would expect the male children to grow to a body size somewhere between their dad and their mom’s brother.
- Comment on If I invented a shirt that caused cameras to be damaged when filmed/photographed, would I be committing a crime by wearing the shirt at events with cameras? 2 weeks ago:
If you could damage a camera by pointing it at something, the manufacturer would fix the issue before selling it, because no one is buying a camera that does.
Recently, there were news about the LIDAR of Volvo cars destroying camera sensors when they were aimed into the direction of the IR laser beam.
- Comment on YSK that despite being outside of US jurisdiction, Lego has dropped diversity and inclusion terminology from its annual report 2 weeks ago:
And while LEGO is a privately held company, they likely have US investors too.
No, they have not. 75 % are owned by the family, 25 % by the LEGO foundation.
- Comment on Why is the spellchecker in Firefox so abysmal? 3 weeks ago:
The tool is literally named anf languagetool.org has the option to self host.
- Comment on Should I unplug my smart tv from the internet? 3 weeks ago:
- Comment on Should I unplug my smart tv from the internet? 3 weeks ago:
You could also do that “softly” with PiHole, if you intend to use some of the apps, but if you don’t, it’s only beneficial to disconnect it entirely from the internet.
- Comment on Why are there no universities/colleges that start in the afternoons? 4 weeks ago:
However, there are universities (of applied sciences) offering programs for employed people, where the courses subsequently are in the evening.
- Comment on You can (probably should) remove personal information from a photo before uploading it to social media 4 weeks ago:
- Comment on [deleted] 4 weeks ago:
That’s for the ideal case. In a real engine, there is some loss directly at the engine of the compressor.
- Comment on [deleted] 4 weeks ago:
Like the other commentators have already stated, the conditions (temperature difference)in winter and summer are different. However, if the temperature differences are the same, only reversed, heating requires less energy than cooling, as the (electric) power is also transformed to heat which in winter, when in heating mode is also usable heat while in summer, it adds to the heat that needs to be discharged outdoors.
- Comment on Why abc, xyz, etc.? 5 weeks ago:
p and q often also represent arbitrary rational numbers (Q), like m and n often denote natural numbers (N).
- Comment on Why abc, xyz, etc.? 5 weeks ago:
Actually, the use of i,j,k as counters is older than programming. It’s more like the other way round. They implemented making variables starting with i, j, k implicitly integer by default, as i, j, k were commonly used for indexing.
- Comment on Why Space Is Actually Warm! 5 weeks ago:
how a capsule with three people inside is able to freeze when the exterior is exposed to direct sunlight.
The core of the question is: What defines the temperature of the capsule?
While it’s intuitively clear that the astronauts (~3×100 W) and electric devices (if they are running) generate heat in the interior of the capsule, on the outside it’s more complicated:
The first thing that comes in mind is the sun shining onto the capsule (even throug a sphere defined by the solar orbit of the earth with the enormous power of 1361 W/m^2) heating up its surface. Yet, as the surface of the capsule is made of shiny aluminium, only 20 % of the radiation is absorbed, the rest is reflected. Additionally, the radiation effectively acts only on an area defined by the cross section of the capsule, not the entire semi-spheric surface directed towards the sun. But anyways, the surface subjected to the solar radiation heats up and…
… itself emits heat radiation with a power proportional to the 4th power of its temperature. The remaining heat is conducted along the hull of the capsule and towards its inside until an equilibrium temperature distribution is reached where the heat generated by the astronauts (and devices), the heat intake from the sun, and the negative contribution due to heat radiation are in an equilibrium.
The NASA engineers surely have designed the properties of the capsule in that manner, that a comfortable ambient temperature inside the capsule is preserved when all electric devices are running as planned. As in the emergency situation these devices were turned off, the equilibrium temperature which adjusts by itself is significantly lower than the designed comfortable temperature. - Comment on Why Space Is Actually Warm! 5 weeks ago:
Heat is the cemetery of energy and is the result of the dissipation of other (higher) forms of energy.
- Comment on Why can't a liquid move faster than the speed of sound in that medium? 5 weeks ago:
but it bounces off particles which makes it take a longer path
If I get the explanation on Wikipedia right, it’s not the photon taking a longer path, but the photon is absorbed by electons and re-emitted after a short delay. This effect is what decreases the speed of light in a transparent medium.
In exotic materials like Bose–Einstein condensates near absolute zero, the effective speed of light may be only a few metres per second. However, this represents absorption and re-radiation delay between atoms, as do all slower-than-c speeds in material substances. As an extreme example of light “slowing” in matter, two independent teams of physicists claimed to bring light to a “complete standstill” by passing it through a Bose–Einstein condensate of the element rubidium. The popular description of light being “stopped” in these experiments refers only to light being stored in the excited states of atoms, then re-emitted at an arbitrarily later time, as stimulated by a second laser pulse. During the time it had “stopped”, it had ceased to be light. This type of behaviour is generally microscopically true of all transparent media which “slow” the speed of light.
- Comment on Why can't a liquid move faster than the speed of sound in that medium? 5 weeks ago:
Nothing is truly incompressible.
Exactly. One usually speaks of quasi-incompressibility when the resistance against compression (bulk modulus) is much greater than the resistance against shear (shear modulus), which is oft the case for liquids such as water.
However, water has a lower resistance against compression (2 GPa) than e.g. steel (160 GPa), which is considered a compressive material. - Comment on Why can't a liquid move faster than the speed of sound in that medium? 5 weeks ago:
“Liquid/fluid” and “gas” don’t necessarily mean the same thing scientifically as they do colloquially, they’re actually very close to the same thing.
Both, liquids and gases, are fluids. The main difference is that liquid phases have a free surface, e.g. the level of water in a glas, whereas gases don’t. Their surface is equal to the surface of their compartment.
- Comment on Can you have an infinitely long wavelength of light? Or is there some maximum? 1 month ago:
Otherwise, the answer would be trivial, about 800 nm.
- Comment on xkcd #3115: Unsolved Physics Problems 1 month ago:
Well, if you are willing to coat your head with copper and some tin on top, you can grow yourself some tin whiskers. Yet, I don’t know if they make a good replacement for hair.
- Comment on xkcd #3115: Unsolved Physics Problems 1 month ago:
Deep in the coating, where the Cu6Sn5 [Remark: intermetallic phase of Sn coating and Cu substrate] is present, the deviatoric strain was high. This indicates that the growth of the intermetallic phase causes plastic deformation of the tin coating.
[…]
A short (4 micrometre) radial gradient in hydrostatic stress was observed around the root of the whisker. This gradient together with long-range diffusion from specific regions could provide the driving force for whisker growth.https://portal.research.lu.se/en/publications/tin-whiskers-experiments-and-modelling
- Comment on xkcd #3115: Unsolved Physics Problems 1 month ago:
A colleague of me did his PhD exactly on the last topic.
