The Periodic Table

Natural convection is a mechanism, or type of heat transport, in which the fluid motion is not generated by any external source (like a pump, fan, suction device, etc.) but only by density differences in the fluid occurring due to temperature gradients. In natural convection, fluid surrounding a heat source receives heat, becomes less dense and rises. The surrounding, cooler fluid then moves to replace it. This cooler fluid is then heated and the process continues, forming a convection current; this process transfers heat energy from the bottom of the convection cell to top. The driving force for...

there stands everything you want to know about this

On the way to success

by density differences in the fluid occurring due to temperature gradients

it happens

PH13

continue

On the way to success

Soo...

PH13

Because of this, the presence of a proper acceleration such as arises from resistance to gravity, or an equivalent force (arising from acceleration, centrifugal force or Coriolis effect), is essential for natural convection. For example, natural convection essentially does not operate in free-fall (inertial) environments, such as that of the orbiting International Space Station, where other heat transfer mechanisms are required to prevent electronic components from overheating.

On the way to success

5:22 AM

It means while free falling there can't be natural convection

So now I get it.

Aren't you a chemcial engineer @PH13

PH13

I'm no chemical engineer

On the way to success

so I am off

PH13

bye

On the way to success

@PH13: Have a nice day, bye

PH13

you too

Freddy

7:00 AM

It should be propane-1,2,3-triol instead of Propan-1,2,3-triol. Because If there are are more then 1 hydroxyl groups, e is not supposed to be removed.(That's what my text-book says) — Freddy yesterday

4

Q: Why is the IUPAC name of glycerol expressed in the way that it is?

I have come across the name trihydroxy propane for glycerol, which I think should've been Propan-1,2,3-triol. Why is it named this way? Is there any other rule of nomenclature working?

santiago

should write that as an answer

PH13

maybe user17307 is german, than without the e would be correct

Freddy

Actually that can be added to current answer.

@PH13 Does German use different rules for nomenclature.

PH13

@Freddy they are essentially the same but we write the words not in english but in german if they exist

most time this only concerns this ending-e ... or alkyne = alkin

Freddy

Oh I see. So, is there any German name for propane?

PH13

7:10 AM

yes, Propan ^^

propane-1,2,3-triol would be indeed Propan-1,2,3-triol ... but as this is an english site I think one should "convert" national versions into the english version that can be discussed here

@Freddy

Freddy

I think I will point that out as different answer

M.A.Ramezani

Eeeek @PH13. You now remind me of the microbes in TV commercials about detergents.

PH13

woohoo

and @M.A.Ramezani good morning

M.A.Ramezani

Morning!

PH13

@Freddy this might be interesting

there are two nice examples near the end:

As can be verified in these two examples, in functional class nomenclature the words are separated by spaces in all five languages. This is not the case for German and some other Germanic languages:

For CH2(COOCH3)2, the translations of the English name dimethyl malonate are ES malonato de dimetilo FR malonate de diméthyle, IT malonato di dimetile, and PT malonato dimetílico, but in German (DE) it is Dimethylmalonat.

A slightly more complicated example in German is C(CH3)2(COOCH3)2: EN dimethyl dimethylmalonate, ES dimetilmalonato de dimetilo. FR…

@Freddy and if you have access to it, this is also a nice overview of IUPAC translation stuff

Levy

7:26 AM

Hello! @M.A.Ramezani

Will you go to physics class today?

M.A.Ramezani

Yep.

Levy

I couldn't go there last week and I 'll go there today for registering.

another question ,a Persian question

Do you have mobtakeran chemistry book?

@M.A.Ramezani

M.A.Ramezani

Nope.

I've read it though.

Levy

OK, forget about it.

M.A.Ramezani

You can buy it from Forouzesh. It's really close to where you wanna go.

Levy

7:41 AM

I have it.

M.A.Ramezani

O.0

K guys, I gotta go, Cya not so soon!

Levy

Cya!

santiago

8:25 AM

seems to be a lot of homework questions lately

PH13

indeed

don't know why google fails so hard the last days

santiago

and worse, a member giving answers to a non-effort question

for example chemistry.stackexchange.com/questions/33677/…

PH13

I know ... I didn't knew what to say on this ... that was hard

santiago

I downvoted the answer

here is another homework vampire chemistry.stackexchange.com/questions/33682/…

PH13

I was wondering if they get punished for wrong or none homework that they are so eager to ask and get the right answers for "their" questions?

santiago

8:34 AM

they have got to put the effort in first

PH13

I know

santiago

there are some good homework questions

fr example - chemistry.stackexchange.com/questions/33680/… - the questioner was quite clear in their thinking

hi @Martin-マーチン!

and this one improved chemistry.stackexchange.com/questions/33669/… - i retracted my close vote and upvoted it

have i scared everyone off?

PH13

8:55 AM

nope

@Martin-マーチン What shall be done with questions that are unanswered but the questioner was never seen again after asking the question?

Martin - マーチン

@santiago nope, but I am currently chatting in a different language ;)

@PH13 Handle them like you would all other questions

If they are bad, downvote

consider flagging for low quality and or off-topic

if they are good, give them an upvote

@PH13 do you have anything specific in mind?

PH13

0

Q: Why is the sodium +1 ion larger than the neon atom?

Why is the sodium +1 ion larger than the neon atom? The removal of the electron from sodium should cause the ion to be the same size as the neon atom.

ions

Martin - マーチン

Down vote! Down vote! Down vote!

Stack Exchange

0

Q: Minimum character change requirement during tag-edit

I recently tried to edit An unkown substance present in urine with the empirical formula CH4N2O to remove the incorrect tag (it has been done now). While doing just a tag-edit (i.e. no changes made in the body), I get a notification saying edits must be 6 characters. But I didn't edit the body...

support

Martin - マーチン

@PH13 This is a bad question...

this can be closed as off-topic

it should be down voted

PH13

9:07 AM

But that changes nothing regarding the question because she has never been seen again ^^

Martin - マーチン

it is abandoned

PH13

ok

Martin - マーチン

the system will take care of low scored unanswered question

meaning deletion

especially when they are closed

PH13

automagically deleting black holes

Martin - マーチン

@PH13 yes, that happens

PH13

9:31 AM

maybe there should be a chemistryhomework.se :D

Martin - マーチン

there have been attempts on area 51 to create exam/homework based sites, but as far as I know they never lead anywhere

Martin - マーチン

10:13 AM

Brace yourselves, finally, it is coming:

102

Q: Upcoming login changes

As y'all know, our current flavor of "global authentication" leaves a few things to be desired. It's flaky, requires a page refresh, etc. etc. Wouldn't it be nice if you could just sign in once and be automatically logged in across the network? We are ready to roll out Stage 1 of Project "Make...

discussion featured login auto-login

santiago

10:27 AM

hmmm

thinking of a question...

@Martin-マーチン can I throw a question by you?

Martin - マーチン

make it a soft throw

santiago

why does milk cause rust in steel?

Martin - マーチン

10:42 AM

I don't know...

santiago

full cream, rather congealed milk, with a teaspoon I found while cleaning a neighbour's apartment

the teaspoon within the congealed mess was rusted

good question?

I am thinking of "Could full cream milk rust a teaspoon?"

Martin - マーチン

Sure why not

santiago

it'll be a weird question

Martin - マーチン

Well then don't ask it ;)

It all depends on how you ask what, how much context you provide

My dad always said, there are no dumb questions

just lazy ones....

santiago

okay I will give it a shot

santiago

11:03 AM

@Martin-マーチン chemistry.stackexchange.com/questions/33686/…

santiago

11:15 AM

lol

user was removed ... lol ...lost 15 rep

Martin - マーチン

@santiago Well, you know you don't have to tell me about new questions, I see them in the other tab right away ;) And in the feed of this chat...

santiago

there is a feed?

sorry about that

Stack Exchange

1:26 PM

0

Q: Should we try to tune the level of detail in answers to the level of knowledge of the questioner?

Somewhat related to this meta question, discussing the proper mix of high-level and common-knowledge level content on a technical SE site, I'm wondering about how we might best go about answering questions on different levels of technical sophistication. In particular, is it problematic when a h...

discussion scope answers

santiago

2:00 PM

wow, some people need reading comprehension classes

no one in here, just a cooment on my question

M.A.Ramezani

3:21 PM

@santiago Tell me about it.

Foof, guys, I need help.

PH13

with what? @M.A.Ramezani

M.A.Ramezani

Make me forget my thirst.

This was a really tough Tuesday.

PH13

ragarding this theme, it's a bit like in Groundhog day with you ;)

M.A.Ramezani

Dunno what that is. I can't think or Google right now.

PH13

Murray plays Phil Connors, an arrogant Pittsburgh TV weatherman who (...) finds himself in a time loop, repeating the same day again and again.

santiago

3:31 PM

my question is taking off - about 400 views already

M.A.Ramezani

What question?

santiago

this one chemistry.stackexchange.com/q/33686/15489

but that probably won't help with the thirst

M.A.Ramezani

4:07 PM

K I got back from my cold shower.

Hi!

Hullo @Levy!

How was class today?

Why are you asking that here?

On another note, it was good.

Levy

How many sessions is it?

50?

M.A.Ramezani

4:11 PM

Dunno, I think 40-60.

Yeah. . . Yeah, something like that.

Levy

How was biking today?

It was enjoyable, wasn't it?

M.A.Ramezani

Yeah. . . My saliva's dried off, I'm dying.

But it's fun!

Levy

a bold fun!

M.A.Ramezani

Hmm . . . 27 mins to iftar.

Levy

M.A.Ramezani

4:16 PM

Nah, that's too colorful. I only drink water for iftar.

Levy

eftar or iftar

M.A.Ramezani

And some cherry juice.

@Levy Iftar is the correct form in English.

Levy

eftar is Persian, but iftar is turkish more.

M.A.Ramezani

Iftar is Arabic; and the English derived the Arabic form.

Levy

M.A.Ramezani

4:18 PM

Well, I'm living in an apartment, not a garden. But yeah, it looks something like that.

Levy

It is not possible to have an Arabic word without حرکه

M.A.Ramezani

And don't worry, you can't provoke me. Others tried earlier.

@Levy That حرکه of yours itself doesn't have حرکه.

Levy

not the written one, the pronounced one.

M.A.Ramezani

@Levy my point is, there's one standard derived form for foreign languages, and in this case, it's iftar. Period.

Levy

There is no حرکه for iftar.

M.A.Ramezani

4:21 PM

There needn't be, since it's in the Latin transcript.

Levy

so, What is the exact Arabic word??????

M.A.Ramezani

A lot of question marks.

Levy

I searched for eftar.
nothing except "breakfast".

Take a look at google.com/….

M.A.Ramezani

google.com.sg/…

And

Iftar

Iftar (Arabic: إفطار‎ ifṭār 'breakfast') is the evening meal when Muslims end their daily Ramadan fast at sunset. For Sunnis, it is at the time of the call to prayer for the evening prayer; for Shias, it is after the evening prayer. == Description == Iftar is one of the religious observances of Ramadan and is often done as a community, with people gathering to break their fast together. Iftar is taken right after Maghrib time, which is around sunset. Traditionally but not mandatory, three dates are eaten to break the fast in emulation of the Islamic Prophet Muhammad, who broke his fast in this...

Levy

so, How is إفطار pronounced?

M.A.Ramezani

4:28 PM

Iftar, because that's the Arabic version's pronunciation.

12 mins to iftar. OMG

Levy

try it.
google translate

M.A.Ramezani

I don't trust Google translate for anything.

Levy

افطار is similar to اخطار

so, there is a کسره

M.A.Ramezani

And how is کسره pronounced in Arabic?

It's more like i, rather than e.

Ding dong; someone forgot how people recite Quran!

Levy

It's not important how to recite.

The meaning is more important, Isn't it?

M.A.Ramezani

4:35 PM

That's the correct form, ignore it if you like.

Levy

No, I accepted that the Iftar is the right form

But, Eftar was better.

M.A.Ramezani

Whatever.

5 mins to iftar.

Levy

Go and prepare your cherry juice.

M.A.Ramezani

Hullo @Mamun! Welcome to the chatroom!

Levy

But, I think sour cherry juice is more delicious.

M.A.Ramezani

4:39 PM

Mine is sour cherry juice.

Levy

Cya! Go and drink some water.

But, not a lot

M.A.Ramezani

1 min to iftar.

Cya!

Iftar in 10 seconds!

mamun

4:59 PM

Thanks! This is my first time in chat room.
Have a nice iftar. This is a blessing from almighty.

M.A.Ramezani

Oh, you a Muslim too?

mamun

Yeah

Are you persian?

M.A.Ramezani

Cool. Your name suggests you're an Egyptian.

mamun

I'm actually Bangladeshi

M.A.Ramezani

@mamun I'm Turkish, but yeah, I'm Iranian.

mamun

5:01 PM

I know some persian, like Hala tun chetoree

Mebinamet (See you)

M.A.Ramezani

Hehe that's some spooky version of Finglish

mamun

:)

I have some Iranian friends here

M.A.Ramezani

Nice!

mamun

I am now in USA for my graduate study

M.A.Ramezani

I prefer to write in the Arabic transcript though.

@mamun Hmm.

mamun

5:04 PM

I can write Arabic on paper but can't type it

چرا؟

Jar?

What?

6:15 PM

@mamun @M.A.Ramezani Hi! I'm back.

M.A.Ramezani

Hey @Levy.

Levy

take alook at en.wikipedia.org/wiki/2015_FIVB_Volleyball_World_League

M.A.Ramezani

Nah, I have more important things to do.

Levy

Which mosque you are going tonight?

M.A.Ramezani

No mosques. Gonna stay at home.

Levy

6:20 PM

you and GOD alone.

M.A.Ramezani

6:55 PM

Hullo @Bon!

bon

hello @M.A

M.A.Ramezani

Hey @Martin I'm making the tag wiki.

M.A.Ramezani

7:09 PM

@Martin done; and I edited the meta post.

bon

@M.A You spelt which wrong :P. Easily done though and easily ammended.

M.A.Ramezani

Which which?

bon

'any other questions witch do not directly' last paragraph of the wiki

M.A.Ramezani

Hehe that's a beautiful typo.

I wonder why and how I made it though/

bon

Dunno. Your english is usually very good

M.A.Ramezani

7:25 PM

I wonder if that was somehow my sub-consciousness's fault.

M.A.Ramezani

8:40 PM

Woohoo! @MadSci your current rep on chem.SE is 3333! Congrats!

Well, not anymore. . .

PH13

good to have some approvers here ;)

M.A.Ramezani

Good to have some people that help me get a reviewer here. Smiley

PH13

^^

M.A.Ramezani

BTW I miss @Lord. Maybe he's traveled to Tokyo to hang with @Martin.

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