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What is the full form of rH?

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What is the full form of rH?

(a) Rhesus factor

(b) Relative humidity

(c) Rush hour

(d) Radio head

I had been asked this question during an online exam.

This intriguing question comes from Curing of Fresh Concrete topic in chapter Fresh Concrete of Concrete Technology

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Right choice is (b) Relative humidity

Easy explanation: Relative Humidity (RH) is the ratio of the amount of water vapor in the air at a specific temperature to the maximum amount that the air could hold at that temperature.

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