Question

Estimate the number of liters of water a human drinks in a lifetime. Suppose that a human drinks 2 L of water per day, and the approximate lifetime is 70 years.

Answer 1

Using the dimension analysis, converting the years to days

`70 year =(365 days)/(1 year) =25550 days`

second, multiply the number of day and the number of liters per a day

The number of liters =
`2 (Litters)/(day) * 25550 day = 51100` L