If a drip of water is equivalent to $\frac{1}{4}$ of a milliliter, how many drips are in a liter of water? Note: 1 liter = 1000 milliliters.
To find the number of drips in a liter of water, I need to divide the total volume of water by the volume of one drip. That is, I need to calculate $\frac{1000}{\frac{1}{4}}$. To divide by a fraction, I can multiply by its reciprocal. So, $\frac{1000}{\frac{1}{4}} = 1000 \times \frac{4}{1} = 4000$. This means there are 4000 drips in a liter of water. 