一、理化性质氯气为黄绿色，气体相对密度2．94，液氮溶于水，相对密度为3．二，熔点-34．6℃，液氯由液态变为气态体积扩大400倍。空气中最高允许浓度0．002毫克／升，超过2．5毫克／升人吸入后立即死亡。氯本身不燃烧，但能助燃，与氢气混合，即使没有空气和火源，在光照条件 First, the physical and chemical properties of chlorine is yellow-green, the relative density of gas 2.94, liquid nitrogen soluble in water, the relative density of 3. Second, the melting point of -34.6 ℃, liquid chlorine from the liquid into a gaseous volume to expand 400 times. The maximum allowable concentration of air 0.002 mg / l, more than 2.5 mg / l inhalation immediately after death. Chlorine itself does not burn, but it can assist combustion and mix with hydrogen even in the absence of air and ignition sources, under light conditions