Moisture vapor transmission rate

Moisture Vapor Transmission Rate (MVTR) is like a game where water tries to sneak out of a material. Like when you wet your pants and the water goes through to the other side. MVTR tells us how good or bad a material is at stopping water from escaping. Sometimes we want materials to keep water in, like when we want to keep our skin from drying out, and other times we want them to keep water out, like when we want to keep our clothes dry when it's raining.

MVTR is measured by putting a material in a special container, and then putting a little bit of water on top of it. We cover it with a lid that has a sensor, which measures how much water vapor escapes through the material. The bigger the number on the sensor, the more water that has escaped through the material.

So, if we have two materials, say Material A and Material B, we can measure their MVTR by putting them in these containers and comparing the sensor readings. If the sensor for Material A is higher than that of Material B, it means that Material A lets more water vapor out than Material B.

Scientists use MVTR to help us pick the right materials for different jobs, like making diapers or clothes or skin patches. That way, we can make sure that the material we pick is good at keeping moisture in or out, depending on what we need it for.

In short, moisture vapor transmission rate is like a game of trying to block water from sneaking through a material, and scientists use this measurement to find the best materials for different jobs.