What type of heat transfer takes place when you come in contact with a snow flake on a cold day?

When the volume and number of particles of a gas are constant which of the following is also constant

Draw the skeletal structures of two different molecules that are each made of 5 carbon atoms and 12 hydrogen atoms.

Which process does not require the presence of a physical substance in order to transfer heat? air in the atmosphere is heated by the ground. this warm air then rises, and cooler air falls. this is an example of what type of process? how is conduction different from radiation?