CO2 means carbon dioxide.
Heat input means the product (expressed in mmBtu/time) of the gross calorific value of the fuel (expressed in Btu/lb) and the fuel feed rate into the combustion device (expressed in mass of fuel/time) and does not include the heat derived from preheated combustion air, recirculated flue gases, or ex- haust from other sources.
Catechumen means a member of the catechumenate of a Catholic Church. This will normally be evidenced by a certificate of reception into the order of catechumens.
Pipeline means any pipe, pipes, or pipelines used for the intrastate transportation or transmission of any solid, liquid, or gaseous substance, except water.
Peak tube potential means the maximum value of the potential difference across the x-ray tube during an exposure.