| 摘要 |
<p>Indicator tube for detecting and measuring alcohol content in air, esp. breath, contg. a reactive expanded perlite layer impregnated with a soln. of chromic acid in 100% H2SO4, is provided with a second control layer for water vapour applied in direction of air flow through tube. Control layer absorbs the water vapours contained in 1L exhaled air.</p> |
