"What makes the difference in degrees?"
"The difference in the heat," said Frank.
"If the water was boiling and the thermometer large enough," said Uncle
Robert, "it would go to two hundred and twelve."
"That would be ninety-seven degrees higher," said Frank.
"Wouldn't that be a big thermometer!" exclaimed Susie.
"Now put the thermometer on the floor," said Uncle Robert.
"It's seventy-two degrees now," said Donald in a few minutes.
"Let's put it on the broom," said Susie, "and hold it up to the ceiling."
"It's warmer up there," said Frank, looking at the little gray cylinder when they brought it down. "It is six degrees higher than it was on the floor."
"Why?" asked Uncle Robert.