I would like to know the thermal conductivity (with proper units) of the
disposable styrofoam cups so commonly used to serve coffee.
I believe styrofoam is about 5% polystyrene and commonly 95% CO2 or Pentane
(sometimes air or other gas?), therefore the thermal conductivity (K =W/m/C?)
is probably close to that of the air or gas used.
If no thermal conductivity data is available, confirmation of the 5%
polystyrene and identification of the trapped gas will help.
Thank you in advance.
Owen von Kugelgen
High School Physics Teacher
(kugelgen@aol.com)