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==Respiration==
Most plants are constantly respiring and cannabis is no exception. In the process of repirationrespiration, plants uptake Carbon and expel Oxygen. CO<sub>2</sub> is essential to other processes such as photosynthesis. Airflow/wind speed has a strong effect on the rate of respiration and transpiration.<ref>https://doi.org/10.1016/S0273-1177(02)00747-0 - Effects of air current speed on gas exchange in plant leaves and plant canopies (2003)</ref> The rate of respiration is directly correlated with the stomata density on growing leaves.<ref>John W. Kimball, 2020. Gas Exchange in Plants. Available at: https://bio.libretexts.org/@go/page/5785 [Accessed March 11, 2022].</ref>
=== Supplimenting additional CO<sub>2</sub> ===
In a city typical Co<sub>2</sub> levels are around 400-450ppm. This is acceptable for a growing plant but raising levels above 1000ppm can increase growth rates by up to 30% when combined with sufficient light intensity by enabling higher rates of photosynthesis. For info on the limitation of low Co<sub>2</sub> at high levels of light intensity see: [[Light#Upper limit of light intensity|Upper limit of light intensity.]]
== Transpiration ==
The cultivar constantly moves water around internally and releases water vapourvapor into the environment through the stomata, this is the process of transpiration. The rate of transpiration can be approximately determined by the [[Temperature and Humidity#VPD|VPD]] of a plant's environment. The rate of transpiration is also correlated to the light intensity the plant is being exposed to i.e. High light intensity equals a high rate of transpiration. The rate of transpiration is useful to know as it indicates the rate of nutrient uptake. 97% of water Cannabis absorbs will be lost via transpiration, this is a typical characteristic of a C3 plant.
==Circadian rhythm==
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