Goods are sold by weight not by volume.

货物按重量卖，不是按体积卖。

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Reduce the volume of trash you have to pack out and save weight by repackaging solid food into plastic bags and liquids into reusable containers.

为了减少你必须打包带走的垃圾的数量和重量，可以通过把固体食物重新包装放在塑料袋中，将液体灌入可重复利用的容器中。

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Experiments have proved that the micro vibration sensor constructed by this new method has many advantages of small volume, low weight, low cost, high sensitivity and high accuracy.

实验证明，用这种方法构建的微振动传感器体积小、质量轻、价格便宜，并且具有很高的灵敏度和准确度。

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The brains of those aged 40 and older decrease in volume and weight by 5% every ten years.

ECONOMIST: The ageing brain

Airships demonstrate a law of increasing returns: doubling the length increases the surface area (and hence weight) by a factor of four while the volume (and hence lifting capacity) goes up by a factor of eight.

ECONOMIST: Pushing the envelope

Thanks to a complete redesign of the internal architecture, the volume and weight of the new PS3 has been reduced by more than half compared to the very first PS3 model with a 60GB HDD, and by 20% and 25% respectively compared to the current PS3.

ENGADGET: Sony announces a slimmer PlayStation 3, 250GB bundle launches September 25th for $269