The water molecules now in your body were once part of a molecular cloud. only about onemillionth of the mass of a molecular cloud is in the form of water molecules, and the mass density of such a cloud is roughly 1.5×10−21 g/cm3.
1. estimate the volume of a piece of molecular cloud that has the same amount of water as your body.
2. how does this volume compare with the volume of the entire earth?
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