Binary means composed of two pieces or two parts and may refer to:
Binary is a techno-thriller novel written by Michael Crichton in 1972 under the pen-name John Lange. Michael Crichton also directed Pursuit, a TV-Movie version. The story of both the book and the film revolve around a deadly nerve agent composed by combining two different chemicals. Hard Case Crime republished the novel under Crichton's name in 2013.
The villain is a middle-class small businessman named John Wright who decides to assassinate the President of the United States. He spends his life savings to carry out the theft of a U.S. Army shipment of the two precursor chemicals that form a deadly nerve gas codenamed VZ when combined.
The ingredients for the nerve gas VZ were intended to be detonated in downtown San Diego, corresponding with the arrival of the President to attend a Republican party conference taking place there. This nerve gas had no safe antidote, and it kills in two to three minutes after being inhaled or touched.
This nerve gas is contained inside two "Alacran" (a combustible plastic) tanks, and plastic explosives are wrapped around the containers, so that when after the nerve gas is released, the containers explode, rendering the scene of the crime untraceable.
Binary chemical weapons or munitions are chemical weapons wherein the toxic agent in its active state is not contained within the weapon. Rather, the toxin is in the form of two chemical precursors, physically separated within the weapon. The precursors are designed to be significantly less toxic than the agent they make when mixed, and this allows the weapon to be transported and stored more safely than otherwise. The safety provided by binary chemical weapons is especially important for people who live near ammunition dumps.
The chemical reaction takes place when the weapon is deployed. Firing the munition or other deployment action removes the barrier between the two precursors, so they can react with one another. Commonly, there is a final stage which utilizes a bursting charge to aerosolize and distribute the chemical agent.
Binary chemical weapons are chemical weapons within the scope of the chemical weapons convention and therefore their production, use and stockpiling is forbidden in most countries. As at least one of the individual chemicals is likely to be a Schedule 1 chemical for which large scale production is forbidden.