Lack of a flow medium will inhibit conduction and convection.
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Conduction, convection, radiation.
Yes. It depends on the ambient environment. If you are in a room full of liquid helium, I am sure -80 deg C will be reached by convection.
Thermal energy can be transferred by conduction, convection, or radiation. The formulae for the rate of transfer - if that's what you are after - vary, depending on which type of transfer is predominant.
As one of the railroad's best conductors, my grandfather was in charge of conduction.
Convection waves are invisible: You can't see them.