Category Nuances for flue_gas:

• atmospheric,
• expensive,
• industrial,
• additional,
• dilute,
• electrical,
• external,
• warm,
• chemical,
• appropriate,
• gaseous,
• heated,

Simple Categories for flue_gas:

• substance,
• unit,
• equipment,
• gas,
• fluid,
• agent,
• waste,
• process,
• mixture,
• means,
• appliance,
• medium,