chornedsnorkack
National Hazard
Posts: 523
Registered: 16-2-2012
Member Is Offline
Mood: No Mood
|
|
What is ppm?
Since 1 bar is 100 000 Pa, is 1 Pa partial pressure by definition 10 ppm?
|
|
|
DraconicAcid
International Hazard
Posts: 4278
Registered: 1-2-2013
Location: The tiniest college campus ever....
Member Is Offline
Mood: Semi-victorious.
|
|
Only if the total pressure is 1 bar.
Please remember: "Filtrate" is not a verb.
Write up your lab reports the way your instructor wants them, not the way your ex-instructor wants them.
|
|
|
Texium
Administrator
Posts: 4516
Registered: 11-1-2014
Location: Salt Lake City
Member Is Offline
Mood: PhD candidate!
|
|
1 ppm = 0.0001%
|
|
|
chornedsnorkack
National Hazard
Posts: 523
Registered: 16-2-2012
Member Is Offline
Mood: No Mood
|
|
Does this depend on molar mass?
Is ppm, as quoted in danger limits, smell thresholds, et cetera, in ml per million ml (m3), thus mPa per kPa? Or is it mg/kg?
When mercury at 20 C has saturated vapour pressure of 0,17 Pa, does it mean saturated mercury fumes are 1,7 ppm? Or are they 12 ppm (because Hg is
also about 7 times the molar mass of air)?
|
|
|
Texium
Administrator
Posts: 4516
Registered: 11-1-2014
Location: Salt Lake City
Member Is Offline
Mood: PhD candidate!
|
|
For air, I believe ppm is generally defined as volume of selected gas / total volume of air. For liquids, it’s expressed as mg solute / kg solvent
(and for dilute aqueous solutions, often serves as a shorthand for mg/L)
|
|
|
barbs09
Hazard to Others
Posts: 113
Registered: 22-1-2009
Location: Australia
Member Is Offline
Mood: No Mood
|
|
We use ppm (parts per million) as a useful measure of concentration of gold in ore, which we also interchange with grams per tonne i.e., 1ppm =
1g/tonne i.e there are 1 million grams in a metric tonne.
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
