An electric room-heater is placed near the floor of a closed room
PHYSICS · Single correct · AP · Physics 2: Algebra-based · Thermodynamics · Thermodynamics
Problem
An electric room-heater is placed near the floor of a closed room. After some time, the air near the ceiling becomes warmer than the air near the floor. The chief mode by which heat reaches the upper layers of air is ______.
(a) conduction through air
(b) radiation from the heater
(c) natural convection currents
(d) forced convection produced by the heater