“Into the water,” said Tom.
Uncle George put more salt in the water, and stirred it up. He kept on doing this until the water would take up no more salt, no matter how much it was stirred. This he called brine.
“Now, Frank, please go and ask mother for a fresh egg,” he said, “and you, Tom, please bring me some fresh water in another glass.”
Egg floating in Salt Water.
Uncle George placed the egg in the glass in which the salt had been put, and it floated in it. He then placed the egg in the glass of fresh water, and it at once sank to the bottom.
“Can you explain this!” he said.
“The salt water is heavier and thicker than the fresh water. That is why it bears up the egg,” said Frank.
“That is very good indeed, Frank. That is just the reason. The salt water or brine is denser, or heavier, than the other.”
Uncle George next took a glass tube with a thistle-shaped bulb at the end of it. Frank kept his finger on the small end, while his uncle poured some of the brine into the bulb. He next tied a piece of bladder skin over the bulb, and placed it in a glass of fresh water, so that the salt water in the tube was at the same level as the fresh water in the glass.