Final answer:
A common fish tank would likely hold around 5 liters of water rather than 5 milliliters, as 5 liters is equivalent to 5,000 milliliters and a fish tank is much larger than an eyedropper, which holds about 1 milliliter.
Step-by-step explanation:
A common fish tank usually holds much more than 5 milliliters of water. Considering the size of common household objects and their capacity, a typical fish tank would likely hold around 5 liters or more. To clarify the matter using unit conversion, 5 liters is equivalent to 5,000 milliliters because when converting a larger unit to a smaller unit, like liters to milliliters, you multiply by 1,000.
Since an eyedropper, which is a small tool for transferring liquid, contains roughly 1 milliliter, and a fish tank is significantly larger than an eyedropper, it's clear that a common fish tank's capacity is better measured in liters rather than milliliters.