规模,比例和数量


Crosscutting Concept 3: Scale, Proportion, and Scale In this video Paul Andersen explains the importance of scale in science and engineering. The Universe varies in size along three scales: size, timespan, and energy. Many phenomenon are too small and fast, or two large and slow to observe.

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下一代科学标准横切概念3:规模,比例和规模
在这个视频中,保罗安德森解释了科学与工程规模的重要性。宇宙沿三个尺度的大小变化:大小,母程和能量。许多现象太小,快速,或两个大而缓慢观察。