CEFR B2

ppm

noun

Meaning

A unit of measurement representing one part of a substance for every million parts of another substance, often used to express very low concentrations.

Examples

The water sample contained only 2 ppm of lead.
Carbon monoxide levels in the room were dangerously high, reaching 100 ppm.

Synonyms: parts per million, parts per thousand, parts per billion, per million

ppm (B2)

noun

Pronunciation: /ˌpiː piː ˈɛm/

Definition

A unit of measurement representing one part of a substance for every million parts of another substance, often used to express very low concentrations.

Examples

The water sample contained only 2 ppm of lead.
Carbon monoxide levels in the room were dangerously high, reaching 100 ppm.
Scientists are monitoring the parts per million of microplastics in the ocean.

How to Use ppm

parts per million (collocation): The full phrase for the unit of measurement. — "The solution had a concentration of 50 parts per million."
measured in ppm (prepositional phrase): To express a quantity using the unit parts per million. — "The toxicity of the chemical is measured in ppm."

Synonyms of ppm

Words with a similar meaning to ppm:

Antonyms of ppm

Words with the opposite meaning to ppm:

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