Why are Air-Conditioning units (ACs) always installed on the upper side of a room?
Correct answer: D. To set up convection currents to cool the room since the cool air is denser and settles down
- A. To prevent someone from bumping into them and hurting themselves
- B. So that the cool wind directly hits the person's face, causing them instant relief
- C. It's just a standard, you can place the units anywhere you like
- D. To set up convection currents to cool the room since the cool air is denser and settles down
Explanation
Warmer air at the bottom is displaced and due to it being less dense, it rises. This process continues and sets up a convection current that will allow thermal transfer to occur. Since cold air is emitted from the AC unit blowers, the unit has to be placed at the top of a room to allow a convection current to form.
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Scientific reasoning evaluates hypotheses through observations, variables, controls, measurements and experimental results. Questions involve identifying independent and dependent variables, recognising a fair test, interpreting tables or graphs, distinguishing evidence from opinion, and deciding whether data supports, rejects or leaves a hypothesis unresolved.
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