When the initial temperature of the medium increased from
20 C to 40 C, the cracking time significantly decreased, but the
effect was not significant when the temperature was higher than
40 C. This could be explained by the properties of waxes on the
tomato skin. Since the melting point of plant wax generally ranges
from 40 C to 100 C, at the same field strength, the waxes would
not melt until the temperature of the media contacting the skin
reaches 40 C or higher. Therefore, when the initial temperature of
the medium was 25 C, more heat generation and time was
required to reach the melting temperature of the waxes to trigger
the ohmic peeling processes. On the other hand, when the initial