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# cheers *drinks*
TJ: my brain has fried. can someone techy/sciency tell me how to convert from micromoles-per-litre to micromoles-per-millilitre ?

i KNOW it's either divided or multiplied by 1000 but i'm stupid and tired and pissed off with these fucking calculations. *cries*
(I helped save b3ta! Seventh is somewhat subdued, Thu 26 Oct 2006, 19:15, archived)
# moles?

MOLES?!
(I helped save b3ta! TopUpTheTea you ain't seen me, right?, Thu 26 Oct 2006, 19:15, archived)
# yep moles!
chemists are odd peoples.
(I helped save b3ta! Seventh is somewhat subdued, Thu 26 Oct 2006, 19:25, archived)
# Approximately
600000000000000000000000 atoms or molecules.

So a micromole is approx. 600000000000000000 atoms or molecules.

It's used for calculating concentrations of solutions.
(I helped save b3ta! Afinkawan Yes I can hear you Clem Fandango, Thu 26 Oct 2006, 19:48, archived)
# divide by 1000
there's quite obviously fewer in a millilitre than a litre ;)
(GoldenFanjita whistle posse blow! horns crew i can't hear you!, Thu 26 Oct 2006, 19:16, archived)
# thank you so much
it confuzzled me with the litres / millilitres being underneath but yes, it makes sense now.

*superhuggles*
(I helped save b3ta! Seventh is somewhat subdued, Thu 26 Oct 2006, 19:22, archived)
# aww go on then why not
*huggles back*
(GoldenFanjita whistle posse blow! horns crew i can't hear you!, Thu 26 Oct 2006, 19:28, archived)
# i have no idea what a micromole is but i would guess
divide
(qdamik, Thu 26 Oct 2006, 19:18, archived)
# a mole is the number of carbon atoms in 1g of carbon
someone's constant that sounds like avocado

so a millionth of that

/vague memories of a-level chemistry blog
(GoldenFanjita whistle posse blow! horns crew i can't hear you!, Thu 26 Oct 2006, 19:21, archived)
# avogadro's
6.022 x10^23

also, i think it's the number of molecules in 12g of carbon....but don't quote me....
(I helped save b3ta! Jsysco is mostly a lurker, mostly, Thu 26 Oct 2006, 19:22, archived)
# Avogadro's Constant?
a mole is 6 x10^23 atoms/molecules of anything.

and it's defined as the number of atoms in 1g of pure Carbon-12

EDIT: how can i know that perfectly and yet not be able to work out i have to DIVIDE by 1000?? stupid brain...
(I helped save b3ta! Seventh is somewhat subdued, Thu 26 Oct 2006, 19:24, archived)
# Avogadro's NUMBER if I remember correctly.
(I helped save b3ta! Afinkawan Yes I can hear you Clem Fandango, Thu 26 Oct 2006, 19:51, archived)
# 1 micromole in 1 litre
is 0.001 micromole (1nm) in 1ml.
hooray
(I helped save b3ta! Jsysco is mostly a lurker, mostly, Thu 26 Oct 2006, 19:20, archived)
# thank you!
*also superhugs*
(I helped save b3ta! Seventh is somewhat subdued, Thu 26 Oct 2006, 19:25, archived)
# a good trick
is not to think about concentrations but about total number of moles, that you want to keep constant. So because 1 milliliter is a 1000th of a liter, you'll have a 1000th of the number of moles.

another way is to follow the units 1uM/L=(1uM/L)*(1L/1000mL) (because there are 1000mL in a L)
(I helped save b3ta! Your watch is BACK, Thu 26 Oct 2006, 19:30, archived)
# thank you!
*takes notes*
i'd just done a bunch of conversions from ug to mmol and then they threw that one in there and i totally stalled.
(I helped save b3ta! Seventh is somewhat subdued, Thu 26 Oct 2006, 19:33, archived)
# Also....
Knock both units down by a factor of 1000.
i.e.

1umol in 1 L
1nmol in 1 ml
1pmol in 1 nl etc.

eventually you'll end up with femto and yoctomoles, which is almost individual molecules
(I helped save b3ta! Jsysco is mostly a lurker, mostly, Thu 26 Oct 2006, 19:33, archived)
# Arrives a bit later
Why not just use google?

Search for

120 micromoles per litre in micromoles per millilitre
(I helped save b3ta! Nun The Wiser : My middle name's still RIS, Thu 26 Oct 2006, 20:22, archived)