The phrase "a demonstration involved" is correct and usable in written English.
It can be used when referring to a situation or context where a demonstration is part of an event or process.
Example: "In the workshop, a demonstration involved the use of various tools to illustrate the techniques being taught."
Alternatives: "a demonstration included" or "a demonstration featured".
Generally, such a demonstration involves an evaluation of the characteristics of the pollutant-bearing gas stream and the capabilities of the technology.
WASHINGTON — In February, a Department of Homeland Security intelligence official wrote a "threat assessment" for the police in Wisconsin about a demonstration involving local pro- and anti-abortion rights groups.
Fifty-four yeago ago there was a demonstration involving about 30 university students, an old bus, and three or four "outback" New South Wales towns.
Typical of his approach was a demonstration involving a Charlie Chaplin mask on a rotating axle, in which he shows how the brain uses prior knowledge of shape, shading, and other light effects to make sense of visual information and assemble a coherent representation of the world.
A demonstration involving titles from Valve's Steam PC platform appeared to bear this out.
The handling of the holy books led to a small hunger strike that quickly morphed into a demonstration involving more than 100 detainees.
And the European Union helped sponsor a demonstration involving low-speed, driverless shuttles that ferried passengers at London Heathrow Airport and in cities such as Rome and La Rochelle, France.
A demonstration involving about two hundred Arubans took place that evening outside the courthouse in Oranjestad in anger over Twitty's remarks, with signs reading "Innocent until proven guilty" and "Respect our Dutch laws or go home".
When Prime Minister Winston Churchill and the United States Army Chief of Staff General George C. Marshall visited the 1st Airborne Division on 16 April 1942, they were treated to a demonstration involving every available aircraft of No. 38 Wing RAF 12 Whitleys and nine Hawker Hector biplanes towing General Aircraft Hotspur gliders.
The switching-station demonstration involved a Nissan Dualis SUV fitted with a battery pack that uses battery cells from A123 Systems, based in Watertown, MA.
