-- Count the number of drops that fall in 1 minute.
-- Then multiply your count by 60.
For a more accurate prediction . . .
-- Pick any number from this list: 2, 3, 4, 5, 6, 10, 12, 15, 20, 30.
-- Call the number you selected 'N' .
-- Count the number of drops that fall in 'N' minutes.
-- Then multiply your count by 60/N .
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60ml x 15 drops/ml = 900 total drops 900 total drops divided by 60 minutes (1 hour) = 15 drops per minute
Converting minutes to weeks is easy. Just multiply by 60 minutes per hour x 24 hours per day x 7 days per week to get 10080 minutes per week. The drops per gallon is a little harder to figure. I assume you are talking water, still, it could vary depending upon the purity and temperature of the water. However, U.S. Geological Survey says that they have made a number of measurements, and figure an average of 15140 drops per gallon. Take your 2 1/2 gallons. Multiply by 15140 to get to drops per week. Divide by 10080 to get to drops per minute. The answer is: around 3.75 drops per minute.
Find the reciprocal
50*10 = 500 drops.
It depends how big the drops are - but it would be 86,400 drops !... Having just done a quick experiment - five drops from my kitchen tap filled a 5 ml teaspoon - so it would be 8.64 litres over a 24-hour period.