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What is the full form of the abbreviation called PPM?

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What is the full form of the abbreviation called PPM?

(a) Parts Per Million

(b) Parts Per Milligram

(c) Parts Per Megagram

(d) Parts Per Millilitre

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This question is from MQ2 Gas Sensor Module in chapter Interfacing of Sensors, Actuators, and Other Modules of Arduino

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Correct answer is (a) Parts Per Million

Easiest explanation: The correct full form of the PPM abbreviation is Parts per million. It is a way of measuring the concentration of a particular gas in the air, by using the ratio of it and comparing it to others. For example: 1000 PPM of LPG means that if you count 1 million gas molecules within a closed space, 1000 of them would be LPG molecules while the rest would be other gases.

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