1. The question asks, why is the external chamber in the Millkan Oil Drop experiment so large? The Millikan Oil Drop is a classic experiment for determing the value of e, fundamental charge, on an electron. In my version of the experiment, I spraw droplets into an external chamber, and then they fall through a hole where they are observed. So, why is the external chamber so large? my attempt at a solution I say that the chamber is large so as to prevent oil droplets being drawn back into the external chamber when they are released from the atomiser. That was just a wild guess though. What do you think?