Video: Converting Volumes between Litres and Millilitres

If 5 drops of water fill up a volume of 5 mL, then how many drops would fill up a volume of 7 L?

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Video Transcript

If five drops of water fill up a volume of five milliliters, then how many drops would fill up a volume of seven liters?

We’re told in the question that five drops of water are equal to five milliliters. This means that one drop would be equal to one milliliter. We need to calculate the number of drops in seven liters. The prefix milli- means one-thousandth. So a milliliter is one-thousandth of a liter. We can therefore use the calculation that 1000 milliliters is equal to one liter. Multiplying both sides of this by seven gives us 7000 milliliters is equal to seven liters. We can therefore conclude that as five drops of water filled up a volume of five milliliters, 7000 drops of water will fill up a volume of seven liters.

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