Acid test
Question: How does putting a few drops of vinegar into water that is being
used for boiling eggs prevent the eggs cracking?
Answer: Adding salt and vinegar to the water in which eggs are boiled does
not prevent eggshells from cracking. Shells crack either because they are
dropped into the saucepan too roughly, or because the air in the air sac at the
broad end of the egg expands rapidly because of the sudden heat increase.
The first of these causes can be avoided by lowering the egg gently into the
water on a spoon, the second by…
