You have a sample that contains 25 microliters of a solution. What is the equivalent number of milliliters?

The conversion from microliters (µL) to milliliters (mL) is straightforward because both are units of volume in the metric system.

1 milliliter (mL) is equal to 1000 microliters (µL).

So, to convert 25 microliters (µL) to milliliters (mL), you would use the following steps:

1. Set up the conversion so the desired unit will be cancelled out. In this case, we want mL to remain, so we set up the conversion as follows:

   25 µL x (1 mL / 1000 µL)

2. The µL units cancel out, leaving us with mL.

3. Do the math: 25 / 1000 = 0.025 mL

So, 25 microliters is equivalent to 0.025 milliliters.