from one particle of the body to another without the actual motion of the particles

from one particle of the body to another by the actual motion of the heated particles.

from a hot body to a cold body, in a straight line, without affecting the intervening medium

none of the above

directly proportional to the thermal conductivity

inversely proportional to density of substance

inversely proportional to specific heat

all of the above

in heat exchanger design as a safety factor

in case of Newtonian fluids

when a liquid exchanges heat with a gas

none of the above

domestic refrigerators

water coolers

room air conditioners

all of these

humidification

dehumidification

heating and humidification

cooling and dehumidification