You pour it instead of pipetting. If you need specific amounts, you use a measuring cylinder. Or you pipette it hastily, leaking some drops along the way. Whic

You pour it instead of pipetting. If you need specific amounts, you use a measuring cylinder. Or you pipette it hastily, leaking some drops along the way. Which of course is a bad idea as it's not very safe, creates a bit of a mess and means your final volume is lower than intended. That is often what happens when students aren't warned about this behaviour of Bromine. It's not terrible (not good of course either) from a safety point of view, cleaning up some drops of Bromine in a fume hood is straightforward. Unless you don't work in a fume hood, which you and other people in the room will regret very quickly.