Reaction

A reaction is the following:

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• In physics, a reaction is defined by Newton's third law: "For every action there is an equal and opposite reaction". The idea that any given force has a pair or opposite force.
• Usually, a reaction is any response caused by some other action.
• Chemical reaction
• Reflex reaction
• light reaction
• Hill reaction
• Chain reaction
• In politics, the reaction is the attitude of the reactionaries, or their political movement.
• In risk management, the reaction is a response after the hazard. Prevention is a response before the hazard materialization.