第十五课

Volume and mass of solids and liquids15固体、液体的体积和质量

In the story "the crow drinks water", the crow puts stones into the bottle and drinks water. Why is this one?《乌鸦喝水》的故事中，乌鸦往瓶内放了石子后喝到了水。这只为什么呢?

Stone, fine thread, wood block, nut, rubber putty, etc.石块、细线、木块、螺母、橡皮泥等。

Activity process活动过程

Do liquids and solids occupy space?●液体、固体占据空间吗?

When the water is full, can the cup be filled with more water?水满后，杯子里还能再装水吗?

Why is there some water left?为什么会剩下一些水?

Is the space occupied by liquid and solid fixed?液体固体占据空间的大小是固定的吗?

The amount of space an object occupies is called volume. Both solid and liquid have a fixed volume.物体所占空间的大小叫体积。固体、液体都有固定的体积。

Do solid and liquid have definite mass?●固体、液体有确定的质量吗?

Will the quality of the dough change after changing its shape?橡皮泥改变形状后，质量会发生变化吗?

The quality of a stone过块石头的质量....

Is soy sauce of certain quality?酱油有确定的质量吗?

soy sauce酱油

Both solid and liquid have definite mass.固体、液体都有确定的质量。

Development activities拓展活动

Take a piece of ice, weigh its mass first, and then weigh it after it melts, and compare the mass before and after.取-块冰，先称一称它的质量，等它融化后再称一称，比较前后质量是否有变化。