BROVANA Â® (arformoterol tartrate) Inhalation Solution is a long-acting beta 2-adrenergic agonist (LABA) indicated for the long-term, twice-daily (morning and evening) maintenance treatment of bronchoconstriction in patients with chronic obstructive pulmonary disease (COPD), including chronic bronchitis and/or emphysema.
The oil drop experiment was performed by Robert A. Millikan and Harvey Fletcher in 1909 to measure the elementary electric charge (the charge of the electron). The experiment entailed observing tiny electrically charged droplets of oil located between two parallel metal surfaces, forming the plates of a capacitor.
He did this by suspending negatively charged oil droplets between two charged plates. He the changed the voltage on the plates to see how this affected the droplets rate of fall. He found that the charge on each oil drop was of the same multiple. That multiple, 1.60x10^-19 coulomb, the charge of an electron.