1. The problem statement, all variables and given/known data When Millikan first performed this experiment, he used water droplets instead of oil. He found he could not suspend the droplets; they would start to move up. Why did this happen? 2. Relevant equations N/A 3. The attempt at a solution The water droplets would have been so small that they evaporated and rose as a gas. The gravitational force wouldn't be strong enough to hold the gas particles in place.