... to the workers, who work in the different filed, such as industry, the agriculture, the scientific organization and so on, and need ... to touch the organic gases and vapors, such as C6H6, CL2, acetone, alcohols, CS2, CCL4, CHCL3, CH3Br, nitro paraffin ... % (volume) in the air or the environment seal up, such as the trough, a jar and so on and also not ...