The mode of heat transfer for an average object at room temperature depends on various factors such as its surface area, composition, and the surrounding environment. However, in general, an average object at room temperature tends to lose more thermal energy via conduction and convection to the surrounding air rather than through emitted radiation.
Conduction is the transfer of heat energy through direct contact between objects or materials. When an object at room temperature is in contact with air or other objects at a lower temperature, heat is transferred from the object to the cooler surroundings through conduction. The rate of conduction depends on factors such as the thermal conductivity of the object's material and the temperature difference between the object and its surroundings.
Convection is the transfer of heat energy through the movement of a fluid (in this case, air). When an object is in contact with air, the air molecules in direct contact with the object become heated and rise, creating a convective current that carries heat away from the object. Convection can be enhanced by factors such as air movement or the presence of fans.
Radiation is the transfer of heat energy in the form of electromagnetic waves, specifically infrared radiation. All objects emit radiation, including those at room temperature. However, at typical room temperatures, the amount of thermal radiation emitted by an object is relatively low compared to the rate of heat loss through conduction and convection. The intensity of thermal radiation emitted by an object increases with temperature, so at higher temperatures, radiation becomes a more significant mode of heat transfer.
In summary, while an object at room temperature does emit thermal radiation, the majority of its heat loss occurs through conduction and convection to the surrounding air.