Convection. The hotter air is less dense than the cooler air already there so, the warmer air will rise to the top of the house while pushing the cooler air down.
yes
radiation
Near The Floor
Near the floor. This allows natural convection currents to mix the warm air as it rises to the ceiling.
hot springs on the sea floor that pump out superheated water from inside earth.
on the floor on the floor
yes
Heating vents should be placed near or on the floor in a room because heat travels up not down.
Heating vents should be placed on or near the floor because heat rises. In rising, it will warm the air of the room. If the heating vent were near the ceiling, the room would stay chilly, even though heat was being poured into it.
radiation
Heating vents should be located near the floor since hot air rises. If the heating vents are located near the ceiling the heat would stay there and not warm the room.
because warm air rises.
in the floor.
Near The Floor
should be on floor.
Warm(er) air rises - if vents were high up there would be little circulation without fans.
This is due tobuoyancy. Think about a hot air balloon as an example. Warm air has greater buoyancy than cooler air and will rise. Conversely, cold air will sink when introduced to a warmer atmosphere and this is why you see cooling vents placed in the ceiling.