3.2.1. Phase of minimal transmission rate (220–70 min)
The absolute humidity of the air (humidity ratio or moisture
content in g water per kg dry air) inside the packaging decreased
from 6.4 g kg1 to 5.7 g kg1 as a result of both transmission
through the film and condensation on cold surfaces. However
absolute humidity increased due to atmospheric evaporation from
wet surfaces and/or transpiration of the fruit.
A small part of the humidity was lost due to transmission
through the film and also due to condensation formation in the
upper range of the packaging (at the inner film surface area) when
external air temperature was low (low level of transmission rate)
and after RH rose to 100% at the measuring point in the central area
of the packaging unit