PH-2142
Convection
Physics · Secondary 4 · Hard · Convection
An electric heater is used to warm the air in a small room. To heat the room evenly, it is placed near the floor. Which statement best explains why this position is effective?
- Warm air near the heater becomes less dense and rises, allowing cooler air to sink and be heated
- Warm air near the heater becomes denser and sinks, pushing cold air upwards
- Heat spreads mainly by radiation, so the heater position in the room does not matter
- Conduction through the floor warms the entire room, so air movement is unimportant
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