Vapor Pressure

Vapor pressure describes the tendency of a volatile compound—including cannabis terpenes—to evaporate into gas phase at a given temperature. In cannabis breeding and processing, understanding vapor pressure is critical because it determines how readily terpenes are lost during drying, curing, extraction, and storage. Terpenes with higher vapor pressure (like limonene and pinene) evaporate more readily; those with lower vapor pressure (like myrcene) remain more stable. Breeders and processors use vapor pressure data to predict terpene retention rates and design preservation protocols. This physical property fundamentally shapes both the chemistry of finished cannabis products and the sensory profile consumers experience.

Cannabis breeders working in controlled-environment agriculture monitor vapor pressure conditions during harvest and post-harvest handling to preserve terpene diversity. Processors selection for specific cultivars often considers the vapor pressure profiles of dominant terpenes—high-volatility strains demand faster, cooler drying, while stable-terpene genotypes tolerate broader handling ranges.