How do I convert mL into µL, and vice versa?  When students
learn the metric system, they usually learn six main prefixes
denoting different units of measurement. For liters, those
measurements, from large to small, are as follows:   • kiloliter
(kL): 1,000 liters   • hectoliter (hL): 100 liters   • decaliter
(daL): 10 liters   • Of course, sandwiched in here is the plain
old liter (L).   • deciliter (dL): 1/10 of a liter (or 10–1
liters)   • centiliter (cL): 1/100 of a liter (or 10–2 liters)
• milliliter (mL): 1/1,000 of a liter (or 10–3 liters)  But the
liter can be broken down into much smaller (or much larger)
parts than just these seven. And that's where the microliter
(µL) comes in. The microliter is 1/1,000,000 of a liter, or 10–6
liters. In other words, a microliter is to the milliliter what
the milliliter is to the liter.  In the metric system,
converting from one unit of measure to another is simply a
matter of moving the decimal point the right number of places.
So, to convert 7L into milliliters