What does the acronym PPM stand for?

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Study for the Grade 9 Environmental Chemistry Test. Use a blend of multiple-choice questions and detailed explanations. Master key concepts and prepare effectively!

Multiple Choice

What does the acronym PPM stand for?

Explanation:
PPM stands for parts per million. It’s a way to express very small concentrations, describing how much of a substance is present relative to a total of one million parts of the mixture. In water, 1 ppm is roughly 1 milligram of contaminant per liter of water; in air, it’s a volume ratio of one part contaminant per one million parts of air. The other options don’t fit because parts per thousand would be a larger fraction (one in a thousand), parts per locale isn’t a real concentration term, and parts per billion is a smaller unit (one in a billion).

PPM stands for parts per million. It’s a way to express very small concentrations, describing how much of a substance is present relative to a total of one million parts of the mixture. In water, 1 ppm is roughly 1 milligram of contaminant per liter of water; in air, it’s a volume ratio of one part contaminant per one million parts of air. The other options don’t fit because parts per thousand would be a larger fraction (one in a thousand), parts per locale isn’t a real concentration term, and parts per billion is a smaller unit (one in a billion).

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