eli5: Why are radiators in houses often situated under a window- surely this is the worst place and the easiest way to lose all the heat?
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Convection. Warm air rises and causes cooler air to be pulled in under it from the other side of the room. The cool air being pulled in lowers the pressure above it which causes the warmer air that has risen to the ceiling to move into the room away from the window.
If you looked sideways at a room with the radiator and window on the left wall the air would be making a circular pattern in a clockwise motion. The warm air is being pulled *away* from the window at the top of the room and the cooler air at the ground is pulled towards the radiator which then heats it up.
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