In order to keep vacuum and withstand atmospheric
pressure,
spacers of 0.5mm in diameter and 0.2mm
thick
are provided
every 2 cm apart. We thought at first that the force to
the spacer was not as much as we found
later,
since the space of vacuum was as few
as 0.2mm.
We have then figured out the pressure given
to the
spacer has been roughly two (2) tons
per
square centimeter.
Therefore, the spacer shall be made of a
substance
that withstands five (5) tons per square
centimeter including
a safety margin.
