>"My favorite was the question of what technique will empty a jug of water fastest. Should you simply turn it upside down and let the air rush in (as it must, to replace the water) in that halting, glug-glug-glug fashion, or hold it at a gentler angle so the pour is unbroken?
Answer: turn the jug upside down and swirl it vigorously to set up a whirlpool effect. This creates a hollow space at the centre of the flow, where air is free to enter. The jug will empty very quickly."
Answer: turn the jug upside down and swirl it vigorously to set up a whirlpool effect. This creates a hollow space at the centre of the flow, where air is free to enter. The jug will empty very quickly."