Respiratory quotient (RQ) The ratio of the volume of carbon dioxide evolved during respiration to the volume of oxygen absorbed: RQ=volume CO2/volume O2 .

• 呼吸商(RQ)：呼吸作用中参与反应的二氧化碳的体积和吸收氧气的体积之比。即RQ=体积CO2/体积O2。