https://www.explainxkcd.com/wiki/api.php?action=feedcontributions&user=162.158.89.124&feedformat=atomexplain xkcd - User contributions [en]2024-03-28T19:54:41ZUser contributionsMediaWiki 1.30.0https://www.explainxkcd.com/wiki/index.php?title=2526:_TSP_vs_TBSP&diff=2190572526: TSP vs TBSP2021-10-09T01:41:01Z<p>162.158.89.124: /* Explanation */ title text explanation reworded and placed last as usual</p>
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<div>{{comic<br />
| number = 2526<br />
| date = October 8, 2021<br />
| title = Tsp vs Tbsp<br />
| image = tsp_vs_tbsp.png<br />
| titletext = It's like one teraspoon / when all you need is a kilonife<br />
}}<br />
<br />
==Explanation==<br />
{{incomplete|Created by ALANIS TURINGETTE - Please change this comment when editing this page. Do NOT delete this tag too soon.}}<br />
This comic plays a joke on the common liquid measurements of {{w|teaspoon}}s (tsp) and {{w|tablespoon}}s (tbsp), which are commonly confused. In the US, a teaspoon is defined as 4.9 mL (0.18 imp fl oz; 0.17 US fl oz) while a tablespoon is defined as 14.8 ml (0.50 US fl oz; 3 tsp).<br />
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It also plays a joke on metric prefixes (based on powers of 10) versus binary prefixes (based on powers of 2), which are also a common source of confusion (see also [[394: Kilobyte]]). In the International System of Units (SI), T (for ''tera-'') signifies a multiplier of 10<sup>12</sup> (that is, 1&nbsp;000&nbsp;000&nbsp;000&nbsp;000), while Ti (''tebi-'', for ''terabinary''), and not Tb, is an ISO standard binary prefix meaning 2<sup>40</sup> (that is, 1024<sup>4</sup> = 1&nbsp;099&nbsp;511&nbsp;627&nbsp;776).<br />
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If "spoon" is understood as US teaspoon, then one teraspoon will be 4&nbsp;928&nbsp;922 cubic meters (1.302 billion US gallons or 3996 acre-feet) and a binary teraspoon will be 5&nbsp;419&nbsp;407 cubic meters (1.432 B gal or 4394 acre-ft). If the US tablespoon is taken as base unit, a teraspoon will be 14&nbsp;786&nbsp;765 cubic meters and a binary teraspoon 16&nbsp;258&nbsp;220 cubic meters – roughly equivalent to six thousand Olympic-size swimming pools or slightly more than six times the volume of the Pyramid of Giza. All these units have fairly limited uses in cooking{{Citation needed}}.<br />
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The title text is a play on a lyric from the Alanis Morissette song "{{w|Ironic (song)|Ironic}}": "It's like ten thousand spoons when all you need is a knife." Randall changes the line to "teraspoon" and "kilonife". The "kilonife" comes from ''knife'' being interpreted as "nife" with a ''k'' prefix – ''k'' being the SI symbol for ''kilo-'' –, in a similar vein as taking ''tsp'' for "teraspoon".<br />
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==Transcript==<br />
{{incomplete transcript|Do NOT delete this tag too soon.}}<br />
:Cooking tips: tsp vs tbsp<br />
<br />
:[left column:]<br />
:<big>Tsp</big><br />
:Teraspoon <br />
:1,000,000,000,000 <br />
:(10<sup>12</sup>) spoons<br />
<br />
:[right column:]<br />
:<big>Tbsp</big><br />
:Binary tsp <br />
:1,099,511,627,776 <br />
:(1024<sup>4</sup>) spoons<br />
<br />
{{comic discussion}}<br />
[[Category:Computers]]<br />
[[Category:Tips]]<br />
[[Category:Math]]<br />
[[Category:Food]]</div>162.158.89.124https://www.explainxkcd.com/wiki/index.php?title=Talk:40:_Light&diff=218854Talk:40: Light2021-10-05T16:50:12Z<p>162.158.89.124: </p>
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<div><br />
== Bruh ==<br />
bruh<span> — [[User:Sqrt-1|The <b>𝗦𝗾𝗿𝘁-𝟭</b>]] <sup>[[User talk:Sqrt-1|<span style="color: blue">talk</span>]] [[Special:Contributions/Sqrt-1|<span style="color: blue">stalk</span>]]</sup></span> 04:22, 15 December 2020 (UTC)<br />
:bruh [[User:Beanie|Beanie]] ([[User talk:Beanie|talk]]) 12:38, 11 March 2021 (UTC)<br />
:Still better than "First" [[Special:Contributions/162.158.89.124|162.158.89.124]] 16:50, 5 October 2021 (UTC)<br />
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why are there so many cueballs [[Special:Contributions/162.158.126.146|162.158.126.146]] 20:51, 26 March 2021 (UTC)</div>162.158.89.124https://www.explainxkcd.com/wiki/index.php?title=Talk:2520:_Symbols&diff=218550Talk:2520: Symbols2021-09-27T07:41:08Z<p>162.158.89.124: </p>
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<div><!--Please sign your posts with ~~~~ and don't delete this text. New comments should be added at the bottom.--><br />
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Great work by whomever did this, but is it possible R_e is something else? I agree that the numerical aspect makes it seem like a fluid mechanics problem, but I've never seen the Reynolds number with a subscripted e... only a regular size e, such that it is Re, not R_e. [[Special:Contributions/108.162.237.93|108.162.237.93]] 20:36, 24 September 2021 (UTC)<br />
: R sub e (not Re) is Effective Reproduction Number. This is related to infection rates. I'm pretty sure it's R sub e, not Re given that infection rates are very much on his mind right now.<br />
:: It would be out of place relative to all the other entries, though, which are all physics related. IMO it's more likely this was an error.<br />
: Earth's radius is abbreviated "R sub e" [[Special:Contributions/162.158.107.4|162.158.107.4]] 21:30, 24 September 2021 (UTC)<br />
: Could be the remainder of a series (i.e. the error when using the first terms of the series as an approximation). Determining upper bounds on this error is usually very tedious.<br />
: R sub e is tire effective rolling radius (or effective radius)--a radius based on the distance traveled by one rotation of a pneumatic tire. Re is similar to the unloaded radius (for radial tires) and normally larger than the loaded radius (distance from axle to ground).<br />
: My first thought was that this referred to the "real part" operator, although that's typically represented by a plain Re (no subscript).<br />
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Re seems to be related to number theory, like in those papers where's they tediously prove that there are infinities of different sizes.<br />
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Extra vote for number theory theory, I've seen R_e most when referring to Real part of a function, which does often bring in tedious calculations<br />
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T to the fourth power looks like blackbody radiation, any ideas what specifically that formula represents? [[Special:Contributions/162.158.203.22|162.158.203.22]] 20:40, 24 September 2021 (UTC)<br />
:There's an equation for what reflects off a spherical object that is a quartic equation (although I'd expect concave reflectors, not convex ones, to risk skin-burn. Or, more likely something to do with UV (non-)absorbtion or generation, but I imagine someone knows ''exactly'' what it is, without someone like me just guessing wildly. ;) [[Special:Contributions/141.101.99.82|141.101.99.82]] 21:05, 24 September 2021 (UTC)<br />
This wiki does not seem to have a consistent formatting structure for lists<br />
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The ''N<sub>A</sub>'' could also soon become NAN (not a number) thus being only a step away from the dangerous arthmeric error. --[[Special:Contributions/162.158.88.43|162.158.88.43]] 21:38, 24 September 2021 (UTC)<br />
<br />
'''Bold Title'''<br />
:Content starting with a tab<br />
<br />
<br />
*'''Bold title''' content continues on same line<br />
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*Regular title<br />
Content on a new line, but not starting with a tab<br />
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As well as tables and mixes of these formats. Maybe someone should pick one and apply it to all the explanations. I just noticed it because of the inconsistencies as people are quickly throwing something together for this new comic. [[Special:Contributions/162.158.107.4|162.158.107.4]] 21:02, 24 September 2021 (UTC)<br />
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I read the penultimate line as "Mg" and was trying to imagine a meaning for "megagrams per kilogram". Sloppy Greek letter there, Randall. [[User:Nitpicking|Nitpicking]] ([[User talk:Nitpicking|talk]]) 03:17, 25 September 2021 (UTC)<br />
::I find this criticism very unreasonable. Randall's "m" is written very differently, there are plenty of examples of it in this very cartoon to avoid confusion, and micrograms are far more commonly used than megagrams. I had no problem whatsoever recognizing the letter mu, and I don't see how this could be a problem for anyone already familiar with that letter. [[Special:Contributions/162.158.90.85|162.158.90.85]] 11:11, 26 September 2021 (UTC)<br />
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Why are partial derivatives considered graduate-level? They're typically covered in first level undergraduate science courses, along with gradients and such. [[User:FPSCanarussia|FPSCanarussia]] ([[User talk:FPSCanarussia|talk]]) 03:34, 25 September 2021 (UTC)<br />
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The reference to "micrometer" links to the Wikipedia page for the measuring device, but it should link to the page for the unit of length: https://en.wikipedia.org/wiki/Micrometre [[User:Professor Frink|Professor Frink]] ([[User talk:Professor Frink|talk]]) 15:58, 25 September 2021 (UTC)<br />
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Adding to “Micrometer/Micrometre” above: this “any” is not really correct:<br />
:Of course, micrometers are used as a measurement of distance in other contexts, but any distance-measuring device capable of accurately measuring micrometer distances would also be expensive.<br />
The “Micrometers” as seen in the Wikipedia article can measure distances of some micrometers accurately, but are not really expensive. Probably even cheaper than any equipment which can ''not'' measure distances. --[[Special:Contributions/162.158.88.239|162.158.88.239]] 18:19, 25 September 2021 (UTC)<br />
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In certain circles (or, perhaps, between them as they roll), the typical Reynolds number is {{w|Reynolds Technology|just three digits}}... ;) [[Special:Contributions/162.158.159.95|162.158.159.95]] 20:04, 25 September 2021 (UTC)<br />
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"When radiative transfer is large enough to be the most important form of heat interchange, it is normally also large enough to sear the skin with thermal or ultraviolet burns." Radiative transfer is the dominant heat transfer from a (idle) human body in a 20C room. There is no risk of seared skin in this situation. As an aside if people understood the role of radiative heat transfer we'd have more comfortable and cheaper HVAC systems (and more underfloor heating).[[Special:Contributions/172.70.34.91|172.70.34.91]] 20:08, 25 September 2021 (UTC)<br />
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I cannot recall ever using Avogadro's constant in a stochiometric calculation. You do everything in mole or gram mole. N<sub>A</sub> implicitly cancels and never even appears.[[Special:Contributions/172.70.34.91|172.70.34.91]] 20:08, 25 September 2021 (UTC)</div>162.158.89.124https://www.explainxkcd.com/wiki/index.php?title=2520:_Symbols&diff=2184152520: Symbols2021-09-24T20:31:17Z<p>162.158.89.124: /* Explanation */</p>
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<div>{{comic<br />
| number = 2520<br />
| date = September 24, 2021<br />
| title = Symbols<br />
| image = symbols.png<br />
| titletext = "röntgen" and "rem" are 20th-century physics terms that mean "no trespassing."<br />
}}<br />
<br />
==Explanation==<br />
{{incomplete|Created by an internet argument - Please change this comment when editing this page. Do NOT delete this tag too soon.}}<br />
<br />
This comic discusses different symbols found in equations, and humorously comments on their implications.<br />
*d/dx: An undergrad is working very hard<br />
d/dx is the symbol for a single-variable {{w|Derivative|derivative}}. This is a mathematical operation that, while difficult, is well within the reach of an undergraduate student, particularly in science. Thus, an equation with this operation would be one that would cause an undergraduate student to work very hard.<br />
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*d/dx: An undergrad is working very hard<br />
d/dx is the symbol for a single-variable {{w|Derivative|derivative}} taken with respect to x. This is a mathematical operation that, while difficult, is well within the reach of an undergraduate student, particularly in science. Thus, an equation with this operation would be one that would cause an undergraduate student to work very hard.<br />
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*∂/∂x: A grad student is working very hard<br />
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;R<sub>e</sub><br />
:Reynolds number, used in modelling the flow of fluids. Fluid flow cannot usually be modelled analytically and so a numerical model is necessary.<br />
;(T<sub>a</sub><sup>4</sup> - T<sub>b</sub><sup>4</sup>)<br />
:<br />
;N<sub>A</sub><br />
:Avagadro's constant. If you are using this and not working in Moles there is a good chance that you will make a mistake of a factor of a power of ten. THis could create dangerous amounts of chemicals<br />
;µm<br />
:Micrometers are small. Any equipment that is accurate to that degree is likely to be expensive<br />
;mK<br />
:millikelvin are small changes in temperature, or represent very low temperatures. Equipemnt that uses mK is very expensive<br />
;nm<br />
:Describes the wavelength of laser light<br />
;eV<br />
:describes the energy of a particle beam<br />
;mSv<br />
:The amount of radiation absorbed. <br />
;mg/kg<br />
:The toxicity of a chemical, per kg of body mass. If it is measured in mg/kg it is quite toxic<br />
;µg/kg<br />
:If the chemical is measured in µg/kg it is extremely toxic<br />
;π or τ<br />
:τ = 2π, so it would be easy to make a mistake and use π when τ is correct.<br />
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==Transcript==<br />
{{incomplete transcript|Do NOT delete this tag too soon.}}<br />
<br />
<br />
;d/dx<br />
:an undergrad is working very hard<br />
;∂/∂x<br />
:a grad student is working very hard<br />
;ħ<br />
:oh wow, this is apparently a quantum thing<br />
;R<sub>e</sub><br />
:someone needs to do a lot of tedious numerical work; hopefully it's not you<br />
;(T<sub>a</sub><sup>4</sup> - T<sub>b</sub><sup>4</sup>)<br />
:you are at risk of skin burns<br />
;N<sub>A</sub><br />
:you are probably about to make an incredibly dangerous arithmetic error<br />
;µm<br />
:careful, that equipment is expensive<br />
;mK<br />
:careful, that equipment is <i>very</i> expensive<br />
;nm<br />
:don't shine that in your eye<br />
;eV<br />
:<i>definitely</i> don't shine that in your eye<br />
;mSv<br />
:you are about to get into an internet argument<br />
;mg/kg<br />
:go wash your hands<br />
;µg/kg<br />
:go get in the chemical shower<br />
;π or τ<br />
:whatever answer you get will be wrong by a factor of exactly two<br />
<br />
==Transcript==<br />
{{incomplete transcript|Do NOT delete this tag too soon.}}<br />
<br />
<br />
;d/dx<br />
:an undergrad is working very hard<br />
;∂/∂x<br />
:a grad student is working very hard<br />
;ħ<br />
:oh wow, this is apparently a quantum thing<br />
;R<sub>e</sub><br />
:someone needs to do a lot of tedious numerical work; hopefully it's not you<br />
;(T<sub>a</sub><sup>4</sup> - T<sub>b</sub><sup>4</sup>)<br />
:you are at risk of skin burns<br />
;N<sub>A</sub><br />
:you are probably about to make an incredibly dangerous arithmetic error<br />
;µm<br />
:careful, that equipment is expensive<br />
;mK<br />
:careful, that equipment is <i>very</i> expensive<br />
;nm<br />
:don't shine that in your eye<br />
;eV<br />
:<i>definitely</i> don't shine that in your eye<br />
;mSv<br />
:you are about to get into an internet argument<br />
;mg/kg<br />
:go wash your hands<br />
;µg/kg<br />
:go get in the chemical shower<br />
;π or τ<br />
:whatever answer you get will be wrong by a factor of exactly two<br />
<br />
{{comic discussion}}</div>162.158.89.124