"Quite right," said Fred, "it does, and so gasesand liquids both flow."
"If you pick up the bellows and set them to work," said Will, "you will soon find that air flows, and you know, too, that the wind is only air rushing along.""Teacher made a gas, called carbonic acid gas," said Fred. "We had to take his word that the gas was in the bottle, for we could not see it. But it was very funny to see him pour it out like water from one vessel into another.""But I thought you said the gas was invisible," said Norah.
"So it is," replied Fred. "But teacher held a lighted taper between the two vessels, and told us to watch while he poured out the gas. This is a gas in whichno flame could live, and although we could not see it flow from one vessel to the other, we saw it put out the light as it flowed.
"So then a gas is like a liquid, because they bothflow.
