How do you make one droplet, rather than none or several?
Stretching a liquid filament with a simple probe reveals three regimes. In between, a single droplet can be produced with controlled size and <5% variation.

How do you make one droplet, rather than none or several?
Stretching a liquid filament with a simple probe reveals three regimes. In between, a single droplet can be produced with controlled size and <5% variation.