"m" = milli → means 1/1000 (or 0.001)"L" = liter → unit for liquid volumeIf we write ml (small L), it looks too much like "m1" (m-one), which can be confusing — so scientists and people use uppercase L for liter.✅ So:Correct: mL = milliliter❌ Wrong: ml (because the "l" looks like number 1)