The phrase "obvious application" means that something can be easily and clearly used or applied in a certain way without needing to think or question it. Full definition
The most obvious applications of the measurement and manipulation of quantum systems are atomic clocks of unprecedented accuracy and the eventual advent of quantum computers. (scientificamerican.com)
The membrane's most obvious application is to filter water, but it could be developed for other industrial applications as well, he adds. (sciencemag.org)
The ability to maximise strength while reducing weight means the technique would have obvious applications in the aerospace and automotive industries. (sciencedaily.com)