Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- abbreviation parts per million
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- initialism common Parts per million. (10000 ppm = 1%)
- initialism Pulse Position Modulation
- initialism Process Production Model
- initialism PowerPerformance Management
- initialism pages per minutes
- initialism Prediction by Partial Match
Etymologies
Sorry, no etymologies found.
Support
Help support Wordnik (and make this page ad-free) by adopting the word ppm.
Examples
-
One intermediate action they're contemplating is lowering the discharge requirement on existing platforms to 15 ppm, which is easily doable 95% of the time, but the last 5% will be very tricky for platforms.
-
The majority of samples (128 out of 187) had measurable levels of total hydrocarbons and 28 had levels greater than 10 ppm, which is the level of concern EPA is using for Volatile Organic Compounds (VOCs).
Georgianne Nienaber: Media Contributes to Victim Mentality as Gulf Struggles 2010
-
Human emissions have increased the atmospheric CO2 concentration to 385 ppm, which is 4.0 kg per square metre, or an extra 1.1 kg per square metre.
The Simplest Explanation EliRabett 2010
-
The majority of samples (128 out of 187) had measurable levels of total hydrocarbons and 28 had levels greater than 10 ppm, which is the level of concern EPA is using for Volatile Organic Compounds (VOCs).
Georgianne Nienaber: Media Contributes to Victim Mentality as Gulf Struggles 2010
-
A few years ago, scientists thought that a doubling of carbon concentrations over preindustrial times, to 550 parts per million, was a reasonable line in the sand; in recent years they've revised that figure downward, to 450 ppm, which is what Copenhagen (and the Waxman-Markey bill) aim for.
-
Thus, R400, the most toxic formulation, killed all cells at 20 ppm, which is equivalent to 8ppm in G.
-
A level of 450 ppm CO2 is a mere ~40 ppm below the upper boundary of ~500 ppm, which is the upper limit of stability of the Antarctic ice sheet, formed about 34 million years ago.
-
I note that the Matsui + Pielke paper uses a current value for CO2 of 336 ppm, which is significantly out-of-date, and that biases their estimate of GHG radiative forcing down by about 0.6 W/m2.
-
The late Ordovician had an ice age despite CO2 levels of 4,000 ppm, which is over ten times the current level.
Hansen and Schmidt: Predicting the Past? « Climate Audit 2006
-
Concentrations of CO2 are now 380 ppm -- in other words, off the chart.
Who can sue to force the EPA to regulate greenhouse gases? Ann Althouse 2006
Comments
Log in or sign up to get involved in the conversation. It's quick and easy.