Weight as well. One liter is exactly 1kg of water. In precipitation (rain amount) 1mm is exactly 1l or 1kg of water on 1m². So when they say there will be 8mm of fall, that's expected around 8l per square meter which is quite intuitive.
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Weight as well. One liter is exactly 1kg of water. In precipitation (rain amount) 1mm is exactly 1l or 1kg of water on 1m². So when they say there will be 8mm of fall, that's expected around 8l per square meter which is quite intuitive.