What uses more energy, leaving the fridge door open for 15 seconds or opening and closing it twice?

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Offline thedoc

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CHEEKOS asked the Naked Scientists:
   IF I AM GETTING A GLASS OF WATER FROM THE FRIDGE, DO I CONSUME MORE ENERGY BY LEAVING THE DOOR OPEN FOR 15 OR TWENTY SECONDS, OR OPENING AND CLOSING IT TWICE?
What do you think?
« Last Edit: 03/06/2016 03:50:01 by _system »