First of every we have to pay attention that words “drop” does no refer to any type of measurement Unit. Therefore, and also because the the water cycle, the amount of water in the oceans is not constantly the same. Rivers room constantly flowing right into the sea and also there is a constant evaporation. Also so, indigenous a mathematical allude of view, we execute not aim at obtaining precise answer to this question. Our aim is to obtain an agree approach. The many important suggest of these inquiries is top the pupil come reflect and think about an technique to the problem as well as trying to reach a close answer v a mathematical reasoning. Asking how many drops there space in the s is the exact same of questioning how plenty of sand seed there room on the beaches. Or else: how many leaves room there in trees? exactly how many human being can beat the piano around the world? How plenty of tennis balls can I put in mine classroom? No matter what the situation is, the target is always the same: encouraging pupils come think.

## But, after all, is there any way of understanding the answers?

Yes, there is. To start with, we deserve to admit that a water drop coincides to 0.05ml. The is the same of saying that 1 litre that water contains closely to 20,000 drops. At the moment we are challenged with one more problem: how plenty of litres that water room there in the ocean? The following logical action would be useful to calculation the s volume. The is not easy since the depth is not constantly the same and also besides the the sea coasts are really irregular. Us can try an method by looking the Google the will permits us to uncover that the estimate for the oceans volume is around 1335 numerous cubic kilometres, having in mind the 70% of our Planet’s surface is water. To recognize how many litres there space we will use an equivalence i beg your pardon we are taught throughout the primary school: `1 liter = 1 dm^3`. After some mathematical calculations, us arrive come the conclusion that oceans are formed by `2.67xx10^25` drops, which coincides to the number 267 followed by 23 zeros!

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