SWAMIswami4kids.comScientist
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Scratch your head Guess what happened once. It was Nina's turn to help our chef make breakfast for all of us. On the menu was boiled egg and toasts. While Nina was busy making the toasts, our entire prankster party got into the kitchen and played a big prank (for which we were punished later). Nina had boiled 11 out of 20 eggs already and had kept the 9 raw eggs aside. We simply went and mixed them up. Now the problem was to find out the raw eggs out of the mixed lot without breaking the shell. Finally the prankster party gave a solution to the problem 'how to tell a raw egg from a hard boiled egg? What we did was, just spin the eggs. If the egg spins pretty well on end, it is a hard-boiled egg. If it doesn't spin too well and wobbles, it is a raw egg. Isn't that a simple trick? Try spinning a raw egg and very briefly touching it, just long enough to stop it. When you take your finger away, the egg will start to spin slightly more. This is due to the inertia of the liquid egg inside. |
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| Come on Scientists! Egg in a bottle There are plenty of tricks to do with eggs, one being the egg in the bottle trick. Our friend named Amit, a 13-year-old student from Ahmedabad, has sent this trick to us. Thanks Amit for this wonderful contribution. If you would like to share with us anything related to science mail us at swapnak@rediffmail.com |
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Use a shelled, hard-boiled egg. The egg needs to be free from cracks in the white and smooth. Find a bottle with a neck just small enough that the egg won't fall in (a milk bottle, or some baby bottles). Wad up a little piece of paper and drop it in the bottle (you can also use 2 or 3 wooden matches). Light the paper or matches, allow burning out. And immediately put the egg in the bottleneck, where it should be sucked in (making a very interesting sound in the process). |
Amit also tells us that you can easily get the egg out again by turning the bottle upside down and blowing into it very hard. When you take your mouth away, the egg should pop out. |
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The scientific explanation for this trick is based on the air pressure inside and outside the bottle. We feel that the egg is sucked in the bottle. Actually, the egg isn't sucked in, it's pushed. The fire heats the air inside the bottle. Due to this the air in the bottle becomes less dense and rises out of the bottle. This causes a decrease in air pressure inside the bottle. The higher pressure outside the bottle pushes the egg in the bottle. And for the reverse trick, the explanation is similar. As you blow hard in the bottle, air pressure inside the bottle increases. This leads to the egg being pushed outside the bottle. |
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