Final answer:
500 mL of water is exactly twice the amount as 250 mL of water, without any additives like sugar to affect the comparison.
Step-by-step explanation:
When comparing 250 mL of water to 500 mL of water, we are looking at two different quantities of water. To understand this better, let's use a different example. If we have two full glasses of water and one glass has a single teaspoon of sugar while the other has one-quarter cup of sugar, the amount of space the sugar takes up affects the volume of water each glass can hold. Considering that both glasses are full, the glass with only a teaspoon of sugar contains more water because the sugar occupies less space than the quarter cup of sugar in the second glass.
Now, applying this concept to our original question, if we simply have two volumes of water, without any additives like sugar, we can compare them directly. 500 mL is twice as much as 250 mL. There are no additional substances taking up space, so the comparison is straightforward: the container with 500 mL of water has exactly double the amount of water compared to the container with 250 mL.