noun
moisture vapor transmission rate; MVTR
Technical term used in materials science, packaging, and textile industries to measure how much water vapor passes through a material over time.
このフィルムの水蒸気透過率は非常に低い。
The moisture vapor transmission rate of this film is very low.
Compound of 水蒸気 (water vapor) + 透過 (transmission, permeation) + 率 (rate).