To do this, usually at the disposal of astronauts there is a set of such chemical reagents, each of which, interacting with one of the controlled components, changes its color. The concentration of the component is determined by the nature of the color of the reaction product. Generally speaking, it is advisable to provide the possibility of controlling harmful impurities with on -board means for any manned flight. It should be borne in mind that the need for such control may appear suddenly, for example, after the elimination of the fire of the fire, when there is a probability of unacceptable atmospheric pollution by combustion products.
Generally speaking, it
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