Agricultural Process Engineering

During steady aerobic respiration of apple fruit stored under MAP, rate of $\text{CO}_2$ production is $R_{CO2} = 15\text{ mL/(kg}\cdot\text{h)}$ and rate of $\text{O}_2$ consumption is $R_{O2} = 15\text{ mL/(kg}\cdot\text{h)}$. The respiration quotient $RQ = 15 / 15$ is: