It is purely chemical, like the darkness of the photographic room.

Years ago, in the cleft, he had tried a much simpler, purely chemical solution to the same kind of problem, and had failed.

Ecology could be considered a subset of environmental science, which also could involve purely chemical or public health issues (for example) ecologists would be unlikely to study.

It lives in a purely chemical world, surrounded by molecules that float by.

Its reaction to silicon is "plasmaless", is purely chemical and spontaneous and is often operated in pulsed mode.

Only nuclear power isn't solar-based, unless you count the supernova explosion as being "solar", aside from natural gas, which is purely chemical.

I had a purely chemical response.

In addition to the purely chemical agents there are also a number of abrasives which, in powder form, are frequently mixed with detergents.

As representatives of organizations involved with pesticide policies over the last two decades, we strongly agree that farmers need to adopt alternatives to purely chemical controls.

You don't want to say that it's purely chemical munitions and you find out it's majority of conventional munitions.