901Refrigerators keep food cool mainly by continuously circulating a special substance known as what?
902The cooling effect used in refrigerators and air conditioners is mainly based on the principle that an evaporating liquid does what?
903Microwave ovens primarily heat food by causing which type of molecules within the food to rapidly vibrate?
904What does the abbreviation GPS commonly stand for?
905A GPS device determines its precise location mainly by receiving and analyzing signals from what?
906WiFi technology allows devices to connect wirelessly to a network mainly by transmitting data using what?
907What does the acronym LASER commonly stand for?
908What does the acronym RADAR commonly stand for?
909Radar systems determine the distance and speed of objects mainly by sending out radio waves and analyzing what?
910Which early device was historically used to mechanically record sound and play it back?
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