Candle jars used to create capnophilic environments produce approximately what percent carbon dioxide?

Candle jars used to create capnophilic environments produce approximately what percent carbon dioxide?

• A. Capnophilic incubator with regulator
• B. Candle jar
• C. Anaerobic chamber
• D. Ambient air incubator

Answer: (B)

Capnophilic conditions are environments with higher-than-normal carbon dioxide to support organisms that need more CO2 than is present in room air. The candle jar achieves this simply by burning a candle inside a sealed jar. As the candle burns, oxygen is consumed and carbon dioxide is produced, and because the jar is not exchanging much air with the outside, the CO2 builds up to roughly 5% (often cited in the 5–10% range). This approximate level is enough to support capnophiles without the need for specialized equipment. In contrast, ambient air has only about 0.04% CO2, while more controlled devices can regulate CO2 precisely, and anaerobic chambers focus on removing O2 rather than increasing CO2.