2 jars filled with water are sealed with plastic film A & B. Which film transmits less water vapor?

Both Jars were placed in a controlled 90 degree fahrenheit and 50% humidity room. Film A became hazy with condensation and appeared as if it was getti

Both Jars were placed in a controlled 90 degree fahrenheit and 50% humidity room. Film A became hazy with condensation and appeared as if it was getting sucked into the jar. Film B bubbled outwards from the Jar and did not have any visible condensation.
Which film was less permeable to water vapor?

or:Both Jars were placed in a controlled 90 degree fahrenheit and 50% humidity room. Film A became hazy with condensation and appeared as if it was getting sucked into the jar. Film B bubbled outwards from the Jar and did not have any visible condensation. Which film was less permeable to water vapor?

or:The film bows out because there is more pressure inside than outside. That is because some water evaporates. The other film bows in because it allows water vapor to pass through, reducing the pressure.

Tags:condensation,