How much do the total water on Earth weigh?-zhihu - 知乎 The total weight of water on Earth is approximately 1 39 × 10¹² (1 39 trillion) kilograms This number is calculated by adding up the volumes of all the water on Earth and multiplying it by the density of water Water on Earth includes oceans, rivers, lakes, waterfalls, glaciers, and groundwater, which makes up about 71% of the Earth's surface area According to data from the United States
请问外刊中$trn是什么意思？ - 知乎 trillion 万亿，$trn就是万亿美元的意思。 billion 十亿，$bn十亿美元。 million 百万，$mn百万美元。
现在billion在英、美两个国家的意思还是不同吗？英语和美语在历史沿革上发生了多少差异？ - 知乎 现在 billion 在英式英语、美式英语里面都是一个意思（十亿）了。参考牛津词典的解释 How many is a billion? ： British English has now adopted the American figure, though, so that a billion equals a thousand million in both varieties of English In British English, a trillion used to mean a million million million (i e 1,000,000,000,000,000,000) Nowadays, it's