书城教材教辅科学读本(英文原版)(套装1-6册)
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第4章 第一册(4)

"Liquids flow about, break up into drops, take the shape of the vessel which holds them, and cannot stand in a heap, but always keep a level surface."SUMMARY

Water has no shape of its own. It always takes the shape of the vessel which holds it. Water, milk, oil, and vinegar are liquids.

Solids

"You know what happens, Norah, when I pour water on the table.""Oh yes,"replied Norah; "it flows about, because it is a liquid.""Now I will put this stone on the table. Will the stone flow away too?""No," said Norah, "it will stand where you place it.""Then would it be right to call the stone a liquid?" said Fred.

"No, it cannot be a liquid, for all liquids flow." "We know we can"t pick up water," said Fred. "Itwould run through our fingers, and fall in drops on the floor.