From Longman Business Dictionary
parts per million; a
showing how much of a particular
employees exposed to formaldehyde concentrations of 1 ppm or more
Pictures of the day
Do you know what each of these is called?
Click on the pictures to check.
See all topics
Word of the day
the level of confidence and positive feelings that people have, especially people who work together, who belong to the same team etc
Copyright and legal
How to use