Higher heating rate results in smaller grain size.

高的升温速率可获得较小的晶粒。

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In general, smaller grain size and greater angularity tend to increase the porosity while an increase in range of particle size tends to decrease porosity.

通常，颗粒越小曲率越大孔隙度越大，而当颗粒尺寸增大时孔隙度会减。

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Batteries that are the size of a grain of salt — or smaller — could power sensors that detect viruses, chemicals and more, said Philip Collins, a scientists at the University of California, Irvine.

加州大学欧文分校的的科学家菲利普·科林斯说，尺寸如盐颗粒大小的电池能够给传感器提供动力，为那些用于检测病毒和化学物质等传感器提供动力。

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