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- LETTERS, Page 8Metric Makes It Easy
-
- Some readers objected to the way math professor John Allen
- Paulos calculated the depth to which all the human blood in the
- world would cover New York City's Central Park (EDUCATION, Jan.
- 30). They said the problem is simplified by using the metric
- system. Assume an average of 4 liters of blood per person for
- 5 billion people; that totals 20 billion liters. Since 1 liter
- equals 0.001 cubic meter, the volume is 20 million cubic meters.
- Central Park's area is roughly 3.4 million square meters.
- Dividing 20 million cubic meters by 3.4 million square meters
- yields about 5.9 meters. Thus all the human blood in the world
- would cover the park to a depth of 5.9 meters, or about 19 ft.
- (Paulos said "something under 20 ft.") Easier by a mile.
-