Objects expand when heated and contract when cooled.

物体热则涨，冷则缩。

《新英汉大辞典》

The emergence of superconductivity in certain metals when cooled below a critical temperature is an example of a phase transition.

当温度降至临界温度以下，某些金属会突然失去电阻，出现超导现象，这就是相变的一个例子。

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Practically all substances expand when heated and contract when cooled.

几乎所有的物质都是热胀冷缩的。

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When cooled to room temperature and left to stand, the biodiesel floats up, leaving a layer of glycerine at the bottom.

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Superconductors are materials that, when cooled sufficiently, conduct electricity without resistance.

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The company is also experimenting with a new way of storing the hydrogen that will fuel its cells a fabric made of fibres of activated carbon that can (when cooled with liquid nitrogen) soak up the same amount of energy per kilogram as petrol.

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