固体、液体和气体

根据可观察的性质和行为，比较材料并将其归类为固体、液体或气体

Compare and group materials as solids, liquids, or gases based on their observable properties and behaviour

学习证据 / Evidence

• 能说明固体的特征（形状固定、难以压缩）、液体的特征（会流动、随容器形状变化）和气体的特征（会扩散、充满空间）
• 能将至少八种日常材料分为固体、液体或气体三类
• 能解释类似沙子（由固体颗粒组成）或水蒸气（是气体，不是看得见的水滴）这样的疑难情况

• Define solids (fixed shape, hard to compress), liquids (flow, take shape of container), gases (spread out, fill space)
• Sort at least eight everyday materials into solid, liquid, or gas categories
• Explain tricky cases like sand (solid particles) or steam (gas, not visible water droplets)

评估问题 / Assessment

{{name}}能解释固体（如冰）、液体（如水和气体（如水蒸气）之间的区别，并把日常物品分成这三类吗？

Can {{name}} explain the difference between a solid like ice, a liquid like water, and a gas like steam, and sort everyday things into these three groups?