What does the concentration unit ppm mean?

Made a mistake? ppm means one part per million, which is one part in 10 to the sixth power.

The concentration unit is PPm; I’ve never heard of this unit before

The last edit to this post was made by *nht1 on 2015-10-25 at 20:44. ppm stands for part per million, which means one part in every million; it is similar to %, but it is not a unit. 1 ppm = 0.0001%, or 10 to the power of -6. 10 ppm = 0.001%, 100 ppm = 0.01%, 1000 ppm = 0.1%, and 10000 ppm = 1%. In addition to this, there is also ppb, which stands for part per billion, meaning one part in every billion. There’s also ppt, which stands for part per trillion, meaning one part in every trillion. 1 ppb = 1 ppm × 10^-3 = 0.000001%, or 10 to the power of -9. 10 ppb = 1 ppm × 10^-2 = 0.00001%, 100 ppb = 1 ppm × 10^-1 = 0.0001%, and 1000 ppb = 1 ppm = 0.0001%. Similarly, 1 ppt = 1 ppm × 10^-6 = 0.00000001%, or 10 to the power of -12. 10 ppt = 1 ppm × 10^-5 = 0.00000001%, 100 ppt = 1 ppm × 10^-4 = 0.0000001%, 1000 ppt = 1 ppm × 10^-3 = 0.000001%, 10000 ppt = 1 ppm × 10^-2 = 0.00001%, 100000 ppt = 1 ppm × 10^-1 = 0.0001%, and 1000000 ppt = 1 ppm = 0.0001%. 1% = 10,000 ppm, 10,000,000 ppb = 10,000,000,000 ppt. 1 ppm = 1,000 ppb = 1,000,000 ppt. 1 ppb = 1,000 ppt

MPM is the MPM format. PPM stands for one part per million.

Just to add, does it mean mol/mL, that is, moles per mL?

Well, you’re very professional. . . . . . . . . . . . . . . . . .

These are the quality requirements that foreigners have put forward for our company’s products. I’ve never seen the unit MPM before; it is presumed to be a unit of concentration.

What product quality? Solid or liquid – is that a requirement regarding impurities? Well, that’s ppm

For solid products, the requirements are regarding calcium, hexanoic acid, succinic acid, and total nitrogen; the unit for all of these is ppm.

I really don’t know about this. Wait a bit longer; there will be experts who will help you