NORFOLK, Va. — Most summer days, you hear us talk about “humidity” when describing how the air feels. While many people are familiar with the term relative humidity — the percentage of water vapor in ...

The material can hold one of three structures, the first is at >97% relative humidity and 25 degrees Celcius, the second is at 50% relative humidity and 55 degrees Celcius, and the third is at 50% ...