Temperature and Humidity: Difference between revisions

Temperature and humidity areshare a pairedsingle togetherarticle as they are so closely linked. Generally, humidity in a growing context refers to [https://en.wikipedia.org/wiki/Humidity Relative Humidity] (RH). As temperature decreases the amount of water vapour it can hold before it condenses back into a liquid decreases. In other words, hotter air can hold more water vapour per volume than cold air can<ref>https://www.royalqueenseeds.com/blog-indoor-cannabis-growing-relative-humidity-and-temperatures-n243</ref>. The Temperature and humidity can also be used to calculate the Vapour pressure deficit (VPD) which provides aan measureindication of how opento the cultivar's [[Anatomy_of_Cannabis#Stomata|stomata]] are and it's capacity for [[Plant_processes#gas_exchange|gas exchange]].

VPD is a metric to measure the difference (deficit) between how much water there is in the air (AVP) and the maximum amount of water the air can currently hold (SVP).

An excellent VPD calculator and chart of ideal VPD for each [[Life Stages|life stage]] can be found at [https://www.dimluxlighting.com/knowledge/vapor-pressure-deficit-vpd-calculator/ dimluxlighting.com]

The ideal temperature is range is 24°- 28°C<ref>Chandra et al. (2008) - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3550641/pdf/12298_2008_Article_27.pdf</ref> while the ideal humidity is 40-60%. Of course, the exact ideal values differ between life stages and different strains.