First of every we need to pay attention that words “drop” does not refer to any kind of measurement Unit. Therefore, and because the the water cycle, the amount of water in the oceans is not constantly the same. Rivers space constantly flowing right into the sea and also there is a continuous evaporation. Also so, native a mathematical allude of view, we perform not aim at obtaining an accurate answer come this question. Our target is to gain an agree approach. The many important allude of these inquiries is leading the pupil come reflect and also think about an technique to the problem as well as trying to reach a near answer with a mathematical reasoning. Questioning how many drops there space in the s is the very same of asking how many sand grains there are on the beaches. Or else: how plenty of leaves space there in trees? exactly how many human being can beat the piano about the world? How plenty of tennis balls have the right to I placed in mine classroom? No issue what the case is, the target is always the same: motivating pupils to think.

## But, ~ all, is over there any method of understanding the answers?

Yes, over there is. To begin with, we have the right to admit the a water drop corresponds to 0.05ml. The is the very same of saying the 1 litre the water contains closely to 20,000 drops. At the moment we are confronted with an additional problem: how numerous litres that water space there in the ocean? The adhering to logical step would be advantageous to calculation the ocean volume. That is not easy since the depth is not constantly the same and also besides the the sea coastlines are very irregular. We can try an method by looking the Google the will permits us to discover that the calculation for the oceans volume is about 1335 millions of cubic kilometres, having actually in mind the 70% of our Planet’s surface is water. To know how many litres there are we will usage an equivalence i beg your pardon we space taught throughout the primary school: `1 liter = 1 dm^3`. After part mathematical calculations, we arrive come the conclusion that seas are developed by `2.67xx10^25` drops, which synchronizes to the number 267 followed by 23 zeros!

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