A milliliter (abbreviated as "ml") is a unit of capacity or volume in the metric measurement system that is equal to one thousandth of a liter.
1 milliliter = (1/1000) liter or 1 liter = 1000 milliliters
The milliliter is used to measure things that have small volumes
To calculate the volume of water inside a straw, we can use the straw shown below that has a diameter of about 0.4 centimeters and a height of about 24 centimeters.
We need to use the formula to find the volume of a cylinder since the straw is a cylinder.
r = 0.4/2 = 0.2
Volume = 3.14 × (0.2)2 × 24
Volume = 3.14 × 0.04 × 24
Volume = 3.14 × 0.96 = 3.0144 cm3
The volume is about 3 milliliters
Therefore, if the straw is one-third full, there is approximately 1 milliliter of water. This is illustrated above!