What does 20000 mvtr means?

Question

i've did some research on wikipedia about mvtr/mm water resistance measurement,but i want a better answer (because i know there is one ;)) )

As far as i know 20000 mm (for a jaket/tent) should go for 20 Liters/cm2.

Thanks

Answer 1

Moisture Vapor Transmition Rate ( MVTR ), is the rate at which wator vapor passes through a specific area of barrier material.    MVTR is measured in grams of water vapor, per 100 sq. inches of barrier, per 24 hours.....( g/100in2 / 24 hrs.)