The most common rainfall measurement is the total rainfall depth during a given period, which is expressed in ________.

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1. Rainfall is commonly reported as the depth of water that accumulates over a horizontal surface during a given period.

2. The standard unit for this depth is millimetres, written as $	ext{mm}$. For example, 10 mm of rain means a 10-millimetre deep layer of water (0.01 m) accumulated.

3. The other options (kilopascal $	ext{kPa}$, hectopascal $	ext{hPa}$, millibar $	ext{mbar}$) are units of pressure, not depth.

FINAL_ANSWER: b

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