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What does pphm stand for?

pphm stands for Parts Per Hundred Million

This definition appears frequently and is found in the following Acronym Finder categories:

  • Science, medicine, engineering, etc.

See other definitions of pphm

Samples in periodicals archive:

The chamber is said to offer a compromise for customers' testing requirements between the factory standard single-lamp model producing ozone concentrations of 500 parts per hundred million (pphm) and the high-ozone five-lamp model producting 2,000 pphm.