Ice is 90% water, 10% air.
Snow is 10% water, 90% air.
If you were to put ice in a cup to the top and let it melt, the cup will be 90% full when it melts.
If you were to put snow in a cup to the top and let it melt, the cup will be 10% full, assuming you lightly place the snow in the cup without packing it down.
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