There were eleven of them; all were deeply excited, and two or three of the younger men were observably drunk and reckless.
And therefore also it is prodigious to have thunder in a clear sky, as is observably recorded in some Histories.
A measurable property of a physical system, such as mass or momentum. In quantum mechanics, observables correspond to mathematical operators used in the calculation of measurable quantities. Operators that do not commute, having a nonzero commutator, correspond to observables that cannot be precisely measured at the same time, such as momentum and position. See also uncertainty principle.