If a set of scales is arranged so that one scale is kept dark, and Light is allowed to fall on the other, the lighted scale will sink slowly.
Light has "weight". The pressure of light on the Earth's surface is calculated as two pounds per square mile.
如果将一架精确的天平一頭放在黑暗中，另一頭讓光照到，照到光的那一頭會慢慢往下沉。
光有“重量”。據計算，光對地球表面的壓力為每平方英裡2磅。
- 2平方英裡約為5.18平方公裡，2磅約為0.91千克。換算成我們熟悉的單位，就是光對地球表面的壓力為每平方公裡0.17千克。
圖片來自網絡
Perfectly still water can be lowered to temperatures several degrees lower than the freezing print and remain liquid.
絕對靜止的水，溫度可以降到冰點以下好幾度而仍然保持液态不結冰。
The hardness of ice is similar to that of concrete.
冰的硬度和混凝土相仿。
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