Grains Per Pound-6 Points Cannabis Growers Should Know

Cannabis growers need to understand Grains per Pound(GPP) when they grom cannabis,since GPP is one of properties to help asjust and optimize the humidity and temperature for the indoor cannabis environment.

What is Grains Per Pound

Grains Per Pound (GPP) is a unit to measure the moisture in the air, and the moisture measurement is based on the weight of dry air. The number of grains per pound of dry air expresses the specific humidity.

So, GPP in cannabis growing presents the actual weight of the water in a pound of dry air.

Along with dew point temperature and relative humidity (%RH), it is one of the most commonly-used measurements of air moisture.

As you can imagine, this information is an invaluable resource to allow for adjustments in order to optimize the cannabis growth environment. With that in mind, the aim of this article is to provide a comprehensive overview of what GPP means, how it is calculated, and how useful it can be as a resource for indoor cannabis growers.

It would help you find the right dehumidification system by measuring the actual moisture of a grow room.

Relative humidity is a measure of the percentage of water present in the air - "how much moisture in the air" VS "how much moisture the air can hold at a drybulb temperature". While the GPP is a measurement of the specific weight of the moisture in a pound of air. That is why %RH is referred to as “relative” as opposed to the "absolute" nature of GPP.

Find the post about "relative humidity"

How does GPP Come to be Used for Moisture Measurement?

GPP was not used to measure moisture before, here we have to mention the unit "grains".

The use of grains as a measurement has its origins all the way back in the Bronze Age, when it referred to literal grains of wheat or barley. According to Wikipedia, we can see

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