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2022-02-10 04:27:35

㈠比特币合约交易是什么

1、合约的定义
期货合约是买方同意在一段指定时间之后按特定价格接收某种资产，卖方同意在一段指定时间之后按特定价格交付某种资产的协议。
双方同意将来交易时使用的价格称为期货价格。双方将来必须进行交易的指定日期称为结算日或交割日。双方同意交换的资产称为“标的”。
如果投资者通过买入期货合约（即同意在将来日期买入）在市场上取得一个头寸，称多头头寸或在期货上做多。相反，如果投资者取得的头寸是卖出期货合约（即承担将来卖出的合约责任），称空头头寸或在期货上做空。

2、合约的由来
期货合约是指由期货交易所统一制定的、规定在将来某一特定的时间和地点交割一定数量和质量商品的标准化合约。它是期货交易的对象，期货交易参与者正是通过在期货交易所买卖期货合约，转移价格风险，获取风险收益。
期货合约是在现货合同和现货远期合约的基础上发展起来的，但它们最本质的区别在于期货合约条款的标准化。在期货市场交易的期货合约，其标的物的数量、质量等级和交割等级及替代品升贴水标准、交割地点、交割月份等条款都是标准化的，使期货合约具有普遍性特征。
期货合约中，只有期货价格是唯一变量，在交易所以公开竞价方式产生。

3、合约的分类
数字货币合约可分为：交割合约和永续合约。
（1）交割合约：期货交割是指期货合约到期时，交易双方通过该期货合约所载商品所有权的转移，了结到期未平仓合约的过程。
（2）永续合约：是一种近似杠杆现货交易的衍生品，是以BTC、USDT等币种进行结算的数字货币合约产品。投资者可以通过买入做多来获取数字货币价格上涨的收益，或通过卖出做空来获取数字货币价格下跌的收益。
永续合约与传统期货存在一定差异：它没有到期时间，因而对于持仓时间没有任何限制。为了保证跟踪标的价格指数，永续合约通过资金费用的机制来保证其价格紧跟标的资产的价格。

㈡什么叫套利

广义上的套利是资本市场上的一种获利方式，含义比较广，这里简要讨论一下期货套利

其实了解期货套的李最好方式就是去下载同花顺期货通，通过模拟盘来感受

期货套利是指利用相关市场或相关合约之间的价差变动，在相关市场或相关合约上进行反向交易，以期在价差变动有利时获利的交易行为。

期现套利策略有以下三种：

第一，当前的套利

当前套利是指现货和期货反向操作的套利模式，广泛应用于利率期货和股指期货市场。套利者将在现货市场买入或卖出现货，根据相同的标的资产在期货市场以相同的规模卖出或买入该资产的期货合约，并在未来同一时间平仓。

实际上，因为买卖成份股需要很长时间，而且市场形势会瞬间发生变化，所以大多数人在实践中使用计算机程序自动交易。也就是说，一旦指数现货和期货之间的平价关系被打破，计算机将根据预先设计的程序进行套利交易。

第二，跨期套利

跨期套利通常在同一期货品种不同期限的期货之间进行。具体而言，是指买入或卖出一个短期金融期货，卖出或买入另一个具有相同标的资产的长期金融期货，并在短期金融期货合约到期时或到期前同时对冲这两个期货的交易。

与当前套利相比，跨期套利的限制较少。跨期套利是在同一个市场进行的，而期货市场没有卖空限制，因此跨期套利是套利交易中广泛使用的一种期现套利策略。跨期套利所依赖的指标是基差，当基于同一标的资产的不同期限的期货合约的基差超过正常范围时，可以通过跨期套利获得无风险利润。

第三，跨市场套利

跨市场套利主要在远期外汇市场进行，广泛应用于货币期货。买卖一个交易所的金融期货合约，买卖另一个交易所的相同数量、相同期限的同一金融期货合约，并在未来同时套期保值的交易。

㈢什么是水

水（H2O）是由氢、氧两种元素组成的无机物，在常温常压下为无色无味的透明液体。在自然界，纯水是非常罕见的，水通常多是酸、碱、盐等物质的溶液，习惯上仍然把这种水溶液称为水。纯水可以用铂或石英器皿经过几次蒸馏取得，当然，这也是相对意义上纯水，不可能绝对没有杂质。水是一种可以在液态、气态和固态之间转化的物质。固态的水称为冰；气态叫水蒸气。水汽温度高于374.2℃时，气态水便不能通过加压转化为液态水。
在20℃时，水的热导率为0.006 J/s•cm•K，冰的热导率为0.023 J/s•cm•K，在雪的密度为0.1×103 kg/m3时，雪的热导率为0.00029 J/s•cm•K。水的密度在3.98℃时最大，为1×10^3kg/m3，温度高于3.98℃时，水的密度随温度升高而减小，在0～3.98℃时，水不服从热胀冷缩的规律，密度随温度的升高而增加。水在0℃时，密度为0.99987×10^3kg/m3，冰在0℃时，密度为0.9167×10^3kg/m3。因此冰可以浮在水面上。
水的热稳定性很强，水蒸气加热到2000K以上，也只有极少量离解为氢和氧，但水在通电的条件下会离解为氢气和水。具有很大的内聚力和表面张力，除汞以外，水的表面张力最大，并能产生较明显的毛细现象和吸附现象。纯水有极微弱的导电能力，普通的水含有少量电解质而有导电能力。
水本身也是良好的溶剂，大部分无机化合物可溶于水。
在-213.16℃，水分子会表现出现厌水性。
物理性质：
摩尔质量：18.0153g/mol
密度：水0.998g/cm3（20度）冰0.92g/cm3
熔点：0度273.15k
沸点：100度373.15k（1标准大气压下）
比热：4.184J/（g.K）

水循环

生物圈可以分为水圈，大气圈，岩石圈。水在以上几个区域作如下循环：
1.从海洋或其他水体中也可以从动植物体内蒸发进入空气；
2.从天空中下沉进入海洋，从陆地径流进入海洋；
3.大多数水蒸气从海洋蒸发又返回海洋，但是风将水蒸气刮走穿过陆地从陆地径流流回海洋，大约每年36Tt。水从陆地上蒸发每年71Tt。每年有107Tt的降水，有如下几种形式：最普通的是降雨，冰雹，雾和露水。浓缩的水可以反射阳光形成彩虹。

汉字中的水shuǐ

(象形文。甲骨文字形。中间像水脉,两旁似流水。“水”是汉字的一个部首。从水的字,或表示江河或水利名称,或表示水的流动,或水的性质状态。本义:以雨的形式从云端降下的液体,无色无味且透明,形成河流、湖泊和海洋,分子式为 H2O,是一切生物体的主要成分)
1.同本义 [water]
水,准也。――《说文》
水,准也。准,平也。天下莫平于水。――《释名》
积阴之寒气为水。――《淮南子•天文》
五行一曰水。――《书•洪范》
凡平原出水为大水。――《左传•桓公元年》
水曰清涤。――《礼记•曲礼》
冰,水为之,而寒于水。――《荀子•劝学》
刘豫州王室之胄,英才盖世,众士慕仰,若水之归海。――宋•司马光《资治通鉴》
又如:水铫(烧水用的小型器具);水头儿(风波);水湿(水气;潮气);水蛊病(水臌病);水中丞(砚台旁边用来贮水磨墨的小水盂);水落归槽(比喻心里踏实安定);水喷桃花(比喻脸色好看);水镜先生(指三国时的司马徽,清明如水和镜);水陆杂陈(水陆毕陈。山珍海味一齐陈列出来);水廓(傍水之城廓);水涡(水中漩涡);水馆(临水的馆舍或驿站)
2.特指河流 [river]
在水之湄。――《诗•秦风•蒹葭》
去来江口守空船,绕船月明江水寒。――唐•白居易《琵琶行(并序)》
又如:水口(渡口);水汊(河的支流);水志(记载河道水系的书籍);水牒(指记述河道水系的文献);水谷(山间河沟);水尾(江河的末端);水老鼠(专在船上偷窃的贼);水事(关于江河水利的事宜);水禁(有关河川方面的禁令);水会(河流汇合处)
3.泛指一切水域 [waters]
水府幽深,寡人暗昧,夫子不远千里,将有为乎?――唐•李朝威《柳毅传》
刘备、周瑜水陆并进。――宋•司马光《资治通鉴》
又如:水陆(佛教中的水陆道场);水泊(湖泽);水居(居住于水乡);水隍(水沟);水王(海的别称);水伯(传说中的水神;大河流);水宿(水上宿夜;水中住宿);水脉(水路,地下的伏流);水潦(因雨水过多而积在田地里的水或流于地面的水)
4.汁、液的通称 [liquid]。
如:水礼(果饵等礼物);水果糖(掺用果汁制成的糖果);墨水;口水;泪水;药水;汽水
5.大水;水灾 [flood]
故尧禹有九年之水,汤有七年之旱。――汉•晁错《论贵粟疏》
曰:天地有法乎?曰:水旱疾疫,即天地调剂之法也。――清•洪亮吉《治平篇》
又如:水备(防止水患的设施);水墉(防洪墙)
5.星名 [morning star]。
如:水宿(星座名。古代天文学家对北方列星七宿的总称)
6.官名 [official's name]。
如:水虞(古代官名。掌管川泽的政令);水官(掌管治水、征收鱼税的官)
7.货币中银的含量。银子的成色,转为货币兑换贴补金及汇费之称 [silver content in coins]。
如:贴水;扣水;汇水;水丝(成色低劣的银子)
8.五行之一 [water, one of the five elements]
五行:一曰水,二曰火,三曰木,四曰金,五曰土。――《书•洪范》
9.水生动植物 [water animal or plant]。
如:无力买田聊种水,近来湖面亦收租
10.旧指尼姑和娼妓的痛苦生活境遇 [deep distress]。
如:水局(旧指妓院娼家);水客(跑码头的商人,也指人贩子)
11.额外收入或附加费用。
又“发水”就是“发财” [extra income]
12.指水军 [troops fight on the waters]
诸人徒见操书言水步八十万而各恐慑。――宋•司马光《资治通鉴》
13.水族 [Shui nationality]。中国少数民族之一,居住在贵州省
14.姓
15.五笔拆成II

水的来源

地球是太阳系八大行星之中唯一被液态水所覆盖的星球。地球上水的起源在学术上存在很大的分歧，目前有几十种不同的水形成学说。有观点认为在地球形成初期，原始大气中的氢、氧化合成水，水蒸气逐步凝结下来并形成海洋；也有观点认为，形成地球的星云物质中原先就存在水的成分。另外的观点认为，原始地壳中硅酸盐等物质受火山影响而发生反应、析出水分。也有观点认为，被地球吸引的彗星和陨石是地球上水的主要来源，甚至现在地球上的水还在不停增加。

对气候的影响

水对气候具有调节作用。大气中的水汽能阻挡地球辐射量的60%，保护地球不致冷却。海洋和陆地水体在夏季能吸收和积累热量，使气温不致过高；在冬季则能缓慢地释放热量，使气温不致过低。
海洋和地表中的水蒸发到天空中形成了云，云中的水通过降水落下来变成雨，冬天则变成雪。落于地表上的水渗入地下形成地下水；地下水又从地层里冒出来，形成泉水，经过小溪、江河汇入大海。形成一个水循环。
雨雪等降水活动对气候形成重要的影响。在温带季风性气候中，季风带来了丰富的水气，形成明显的干湿两季。
此外，在自然界中，由于不同的气候条件，水还会以冰雹、雾、露水、霜等形态出现并影响气候和人类的活动。

对地理的影响
地球表面有71%被水覆盖，从空中来看，地球是个蓝色的星球。水侵蚀岩石土壤，冲淤河道，搬运泥沙，营造平原，改变地表形态。
地球表层水体构成了水圈，包括海洋、河流、湖泊、沼泽、冰川、积雪、地下水和大气中的水。由于注入海洋的水带有一定的盐分，加上常年的积累和蒸发作用，海和大洋里的水都是咸水，不能被直接饮用。某些湖泊的水也是含盐水。世界上最大的水体是太平洋。北美的五大湖是最大的淡水水系。欧亚大陆上的里海是最大的咸水湖。
地球上水的体积大约有 1 360 000 000 立方公里. 当中
海洋占了的1 320 000 000立方公里(或97.2%)。
冰川和冰盖占了25 000 000立方公里(或1.8%)。
地下水占了13 000 000立方公里(或者0.9%)。
湖泊，内陆海，和河里的淡水占了250 000 立方公里(或0.02%)。
大气中的水蒸气在任何已知的时候都占了13 000立方公里(或0.001%)。

对生命的影响

地球上的生命最初是在水中出现的。水是所有生物体的重要组成部分。人体中水占70%；而水母中98%都是水。水中生活着大量的水生植被等水生生物。
水有利于体内化学反应的进行，在生物体内还起到运输物质的作用。水对于维持生物体温度的稳定起很大作用。

水的种类
不同的学科对水有着一些不同的称呼：
根据水质的不同，可以分为：
软水：硬度低于8度的水为软水。
硬水：硬度高于8度的水为硬水。硬水会影响洗涤剂的效果，硬水加热会有较多的水垢。

饮用水根据氯化钠的含量，可以分为：
淡水
咸水
此外还有：生物水：在各种生命体系中存在的不同状态的水。
天然水：
土壤水：贮存于土壤内的水
地下水：贮存于地下的水
超纯水：纯度极高的水，多用于集成电路工业
结晶水：又称水合水。在结晶物质中，以化学键力与离子或分子相结合的、数量一定的水分子。
重水的化学分子式为D2O，每个重水分子由两个氘原子和一个氧原子构成。重水在天然水中占不到万分之二，通过电解水得到的重水比黄金还昂贵。重水可以用来做原子反应堆的减速剂和载热剂。
超重水的化学分子式为T2O，每个重水分子由两个氚原子和一个氧原子构成。超重水在天然水中极其稀少，其比例不到十亿分之一。超重水的制取成本比重水还要高上万倍。
氘化水的化学分子式为HDO，每个分子中含一个氢原子、一个氘原子和一个氧原子。用途不大。
此外，水还包括汗水、盐水、尿水、蒸馏水等。

㈠ What is Bitcoin contract trading

1. Definition of contract
A futures contract is where the buyer agrees to receive an asset at a specific price after a specified period of time, and the seller agrees to An agreement to deliver an asset at a specific price after a specified period of time.
The price that both parties agree to use for future transactions is called the futures price. The specified date on which both parties must enter into a transaction in the future is called the settlement date or delivery date. The asset that both parties agree to exchange is called the “subject.”
If an investor takes a position in the market by purchasing a futures contract (i.e. agreeing to buy at a future date), it is called a long position or going long on futures. On the contrary, if the position taken by the investor is to sell a futures contract (that is, to bear the contractual responsibility to sell in the future), it is called a short position or going short on futures.

2. The origin of the contract
Futures contracts refer to standardized contracts formulated by futures exchanges that stipulate the delivery of a certain quantity and quality of commodities at a specific time and place in the future. It is the object of futures trading. Futures trading participants transfer price risks and obtain risk returns by buying and selling futures contracts on futures exchanges.
Futures contracts are developed on the basis of spot contracts and spot forward contracts, but their most essential difference lies in the standardization of futures contract terms. For futures contracts traded in the futures market, terms such as the quantity, quality grade and delivery grade of the subject matter, as well as premium and discount standards for substitutes, delivery location, delivery month and other terms are all standardized, making futures contracts universal.
In futures contracts, only the futures price is the only variable, which is generated through open bidding on the exchange.

3. Classification of Contracts
Digital currency contracts can be divided into: delivery contracts and perpetual contracts.
(1) Delivery contract: Futures delivery refers to the process in which the parties to the transaction settle the expired open positions through the transfer of ownership of the commodities contained in the futures contract when the futures contract expires.
(2) Perpetual contract: It is a derivative similar to leveraged spot trading. It is a digital currency contract product settled in BTC, USDT and other currencies. Investors can gain profits from rising digital currency prices by buying long, or gain profits from falling digital currency prices by selling short.
Perpetual contracts are somewhat different from traditional futures: they have no expiration time, so there is no limit on the holding time. In order to ensure tracking of the underlying price index, the perpetual contract uses a funding fee mechanism to ensure that its price closely follows the price of the underlying asset.

㈡ What is arbitrage

Arbitrage in a broad sense is a way to make profits in the capital market, with a broad meaning. Here is a brief discussion of futures arbitrage

In fact, the best way to understand futures arbitrage is to download Flush Futures and experience it through simulated trading

Futures arbitrage refers to using the price difference changes between related markets or related contracts to trade in related markets or related contracts.The trading behavior of conducting reverse trading on a contract in order to profit when the price difference changes favorably.

There are three types of spot arbitrage strategies:

First, current arbitrage

Current arbitrage refers to the arbitrage model of reverse operation of spot and futures. Widely used in interest rate futures and stock index futures markets. An arbitrageur will buy or sell spot in the spot market, sell or buy a futures contract of that asset in the futures market with the same size based on the same underlying asset, and close the position at the same time in the future.

In fact, because it takes a long time to buy and sell constituent stocks, and the market situation can change instantaneously, most people use computer programs to automatically trade in practice. That is to say, once the parity relationship between the index spot and futures is broken, the computer will conduct arbitrage transactions according to the pre-designed program.

Second, intertemporal arbitrage

Intertemporal arbitrage is usually carried out between futures of the same futures type with different maturities. Specifically, it refers to buying or selling a short-term financial futures, selling or buying another long-term financial futures with the same underlying asset, and hedging the two at the same time when or before the short-term financial futures contract expires. Futures trading.

Intertemporal arbitrage has fewer restrictions than current arbitrage. Calendar arbitrage is carried out in the same market, and there are no short-selling restrictions in the futures market, so Calendar arbitrage is a futures and spot arbitrage strategy widely used in arbitrage trading. The indicator that intertemporal arbitrage relies on is the basis. When the basis of futures contracts of different maturities based on the same underlying asset exceeds the normal range, risk-free profits can be obtained through intertemporal arbitrage.

Third, cross-market arbitrage

Cross-market arbitrage is mainly carried out in the forward foreign exchange market and is widely used in currency futures. The transaction of buying and selling a financial futures contract on one exchange, buying and selling the same financial futures contract of the same quantity and duration on another exchange, and hedging at the same time in the future.

㈢ What is water

Water (H2O) is an inorganic substance composed of hydrogen and oxygen. It is a colorless and odorless transparent liquid at normal temperature and pressure. In nature, pure water is very rare. Water is usually a solution of acids, alkalis, salts and other substances. It is still customary to call this aqueous solution water. Pure water can be obtained through several distillations using platinum or quartz vessels. Of course, this is pure water in a relative sense and cannot be absolutely free of impurities. Water is a substance that can transform between liquid, gas and solid states. Solid water is called ice; gaseous water is called water vapor. When the water vapor temperature is higher than 374.2°C, gaseous water cannot be converted into liquid water through pressurization.
At 20°C, the thermal conductivity of water is 0.006 J/s·cm·K, the thermal conductivity of ice is 0.023 J/s·cm·K, and the density of snow is 0.1×103 kg/m3 At , the thermal conductivity of snow is 0.00029 J/s·cm·K.The density of water is maximum at 3.98℃, which is 1×10^3kg/m3. When the temperature is higher than 3.98℃, the density of water decreases with the increase of temperature. At 0~3.98℃, water does not obey thermal expansion and contraction. According to the law, the density increases with the increase of temperature. When water is at 0℃, the density is 0.99987×10^3kg/m3. When ice is at 0℃, the density is 0.9167×10^3kg/m3. So ice can float on water.
Water has strong thermal stability. When water vapor is heated to above 2000K, only a very small amount will dissociate into hydrogen and oxygen. However, water will dissociate into hydrogen and water under the condition of electricity. It has great cohesion and surface tension. Except for mercury, water has the largest surface tension and can produce obvious capillary and adsorption phenomena. Pure water has very weak electrical conductivity, while ordinary water contains a small amount of electrolytes and has electrical conductivity.
Water itself is also a good solvent, and most inorganic compounds are soluble in water.
At -213.16℃, water molecules will become hydrophobic.
Physical properties:
Molar mass: 18.0153g/mol
Density: water 0.998g/cm3 (20 degrees) ice 0.92g/cm3
Melting point: 0 degrees 273.15k
/> Boiling point: 100 degrees 373.15k (at 1 standard atmosphere)
Specific heat: 4.184J/(g.K)

Water cycle

The biosphere can be divided into the hydrosphere , atmosphere, lithosphere. Water circulates in the above areas as follows:
1. From the ocean or other water bodies, it can also evaporate from animals and plants into the air;
2. From the sky, it sinks into the ocean, and from land runoff Ocean;
3. Most water vapor evaporates from the ocean and returns to the ocean, but wind blows the water vapor away across the land and flows back to the ocean in runoff from the land, about 36Tt per year. Water evaporates from land at 71Tt per year. There are 107Tt of precipitation every year, which comes in the following forms: the most common ones are rain, hail, fog and dew. Concentrated water can reflect sunlight to form a rainbow.

水shuǐ in Chinese characters

(Pictures. Oracle-bone characters. The middle looks like a water vein, and the sides look like running water. "水" is a radical of the Chinese character. From the word "water" The word may represent the name of a river or water conservancy, or the flow of water, or the nature and state of water. Original meaning: a liquid falling from the clouds in the form of rain, colorless, odorless and transparent, forming rivers, lakes and oceans. The molecular formula is H2O, Is the main component of all living organisms)
1. Same as the original meaning [water]
Water, accurate. ――Shuowen‖
Water is accurate. Accurate, even. Nothing in the world is equal to water. ――"Shi Ming"
The cold air accumulated in Yin is water. - "Huainanzi·Astronomy"
One of the five elements is water. ――Book·Hong Fan‖
Wherever water comes out of a plain, it becomes a flood. ――"Zuo Zhuan·Huan Gong Year"
Water is called Qingdi. ――"Book of Rites·Qu Li"
Ice is made of water, and colder than water. ——"Xunzi Encouraging Learning"
Liu Yuzhou's royal family had unrivaled talents and was admired by all scholars, like water returning to the sea. ―Sima Guang of the Song Dynasty, "Zizhi Tongjian"
Another example: Shuichou (a small instrument for boiling water); Shuitouer (turbulence); Shuisheng (water vapor; moisture); Water poison (water poison) Zhibing); Shuicheng (a small bowl next to the inkstone used to store water for grinding ink); water falling into the trough (a metaphor for a steady and stable heart); water spraying peach blossoms (a metaphor for a good-looking face); Mr. Shuijing (referring to Sima Hui during the Three Kingdoms period, Qingming is like water and mirror); Shuilu Zachen (water and land are presented together. The delicacies of mountains and seas are displayed together); Shuijiao (the city outline by the water); Shuivortex (whirlpool in the water); Shuiguan (a building or inn near the water)
2. Specifically refers to the river [river]
In the water of Mekong. ――"Poem·Qin Feng·Jian Jia"
I keep an empty boat at the mouth of the river, and around the boat the moon is bright and the river is cold. ―"Pipa Xing (Preface)" by Bai Juyi of the Tang Dynasty
Another example: Shuikou (ferry); Shui Branch (a tributary of the river); Shuizhi (a book recording the river system); Shuizhi (a record of the river system) literature); Shuigu (mountain ditches); Shuiwei (the end of a river); Water Rat (a thief who steals from a boat); Shui Shi (matters about river water conservancy); Shui Ban (bans related to rivers); Water Hui (the confluence of rivers)
3. Generally refers to all waters [waters]
The water house is deep and dark, and few people are in the dark. Master has traveled thousands of miles, what will happen? ——"Liu Yi Biography" by Li Chaowei of the Tang Dynasty
/> Liu Bei and Zhou Yu advanced by land and water. ―Sima Guang of the Song Dynasty, "Zizhi Tongjian"
Another example: Shuilu (water and land Taoist temple in Buddhism); Shuibo (lake); Shuiju (living in a water town); Shuihuang (water ditch); Shui Wang (another name for the sea); Shui Bo (the legendary water god; big river); Shui Su (staying overnight on the water; staying in the water); Shui Mei (waterways, underground currents); Shui Liao (accumulation due to excessive rain) Water in fields or water flowing on the ground)
4. The general name of juice and liquid [liquid].
Such as: water gifts (gifts such as fruit bait); fruit candies (made with fruit juice)candy); ink; saliva; tears; potion; soda
5. Flood; flood [flood]
Therefore, Yao and Yu had nine years of water, and Tang had seven years of drought. ―Chao Cuo of the Han Dynasty, "On Guishu Shu"
Said: Does heaven and earth have laws? He said: Floods, droughts and epidemics are the laws of heaven and earth. ——"Zhiping Chapter" by Hong Liangji of the Qing Dynasty
Another example: Shuibei (facilities to prevent floods); Shuiyong (flood control wall)
5. Star name [morning star].
Such as: Water Constellation (the name of the constellation. The ancient astronomers’ collective name for the seven constellations in the north)
6. Official name [official's name].
Such as: Shuiyu (the name of an ancient official. In charge of political orders in Sichuan); Shuiguan (the official in charge of water control and collecting fish tax)
7. The silver content of currency. The fineness of silver is referred to as currency exchange subsidies and remittance fees [silver content in coins].
Such as: discount; deduct water; collect water; water silk (poor quality silver)
8. One of the five elements [water, one of the five elements]
Five elements: One is water , the second is fire, the third is wood, the fourth is gold, and the fifth is earth. ――"Book·Hong Fan"
9. Aquatic animals and plants [water animal or plant].
For example: unable to buy land and talk about planting water, and recently the lake has also collected rent
10. It used to refer to the painful living conditions of nuns and prostitutes [deep distress].
Such as: Water Bureau (formerly refers to brothels and prostitutes); Shuike (businessmen running docks, also refers to human traffickers)
11. Additional income or additional fees.
Also "to make water" means "to make a fortune" [extra income]
12. Refers to the water army [troops fight on the waters]
Everyone only sees Cao Cao's book saying that the water steps on the water is eight hundred thousand. Intimidation. ―Sima Guang of the Song Dynasty, "Zi Zhi Tong Jian"
13. Shui nationality [Shui nationality]. One of the ethnic minorities in China, living in Guizhou Province
14. Surname
15. Wubi divided into II

Source of water

The earth is the eighth largest in the solar system The only planet among the planets covered by liquid water. There is considerable academic disagreement over the origin of water on Earth, with dozens of different theories of its formation currently in existence. Some people believe that in the early days of the formation of the earth, hydrogen in the original atmosphere was oxidized into water, and water vapor graduallyIt condensed and formed an ocean; there is also a view that water was originally present in the nebula material that formed the earth. Another view is that silicate and other materials in the original crust reacted and released water due to the influence of volcanoes. There are also views that comets and meteorites attracted by the earth are the main source of water on the earth, and even now the water on the earth is still increasing.

Impact on climate

Water has a regulating effect on climate. Water vapor in the atmosphere can block 60% of the earth's radiation and protect the earth from cooling. Oceans and terrestrial water bodies can absorb and accumulate heat in summer to prevent the temperature from being too high; in winter, they can slowly release heat to prevent the temperature from being too low.
Water in the oceans and on the surface evaporates into the sky to form clouds. The water in the clouds falls through precipitation and turns into rain, and in winter it turns into snow. The water falling on the surface seeps into the ground to form groundwater; the groundwater emerges from the ground to form spring water, which flows into the sea through streams and rivers. Form a water cycle.
Precipitation activities such as rain and snow have an important impact on climate. In the temperate monsoon climate, the monsoon brings abundant water vapor, forming distinct dry and wet seasons.
In addition, in nature, due to different climatic conditions, water will appear in the form of hail, fog, dew, frost, etc. and affect the climate and human activities.

Influence on geography
71% of the earth’s surface is covered by water. From the air, the earth is a blue planet. Water erodes rocky soil, silts rivers, transports sediment, creates plains, and changes the surface form.
The Earth's surface water bodies constitute the hydrosphere, including oceans, rivers, lakes, swamps, glaciers, snow, groundwater and atmospheric water. Since the water injected into the ocean contains a certain amount of salt, coupled with years of accumulation and evaporation, the water in the sea and ocean is salty and cannot be drank directly. The water in some lakes is also salty. The largest body of water in the world is the Pacific Ocean. The Great Lakes in North America are the largest freshwater systems. The Caspian Sea is the largest saltwater lake in Eurasia.
The volume of water on Earth is approximately 1 360 000 000 cubic kilometers. Of this
the ocean accounts for 1 320 000 000 cubic kilometers (or 97.2%).
Glaciers and ice sheets account for 25 000 000 cubic kilometers (or 1.8%).
Groundwater accounts for 13 000 000 cubic kilometers (or 0.9%).
Lakes, inland seas, and rivers account for 250,000 cubic kilometers (or 0.02%) of fresh water.
Water vapor accounts for 13,000 cubic kilometers (or 0.001%) of the atmosphere at any given time.

To lifeThe influence of

Life on earth first appeared in water. Water is an important component of all living organisms. The human body is 70% water; jellyfish are 98% water. There are a large number of aquatic vegetation and other aquatic organisms living in the water.
Water is conducive to chemical reactions in the body and also plays a role in transporting substances within the body. Water plays a large role in maintaining the stability of temperature in living organisms.

Types of water
Different disciplines have different names for water:
According to different water quality, it can be divided into:
Soft water: hardness less than 8 degrees The water is soft water.
Hard water: Water with a hardness higher than 8 degrees is hard water. Hard water will affect the effectiveness of detergents, and heating hard water will cause more scale.

Drinking water can be divided into:
Fresh water
Salt water
According to the content of sodium chloride, there are also: biological water: found in various life systems of different states of water.
Natural water:
Soil water: water stored in the soil
Groundwater: water stored underground
Ultrapure water: extremely pure water, mostly used in the integrated circuit industry
Crystal water: also known as hydration water. In crystalline substances, a certain number of water molecules are combined with ions or molecules by chemical bonding forces.
The chemical molecular formula of heavy water is D2O. Each heavy water molecule is composed of two deuterium atoms and one oxygen atom. Heavy water accounts for less than 20,000% of natural water, and heavy water obtained through electrolysis of water is more expensive than gold. Heavy water can be used as a moderator and heat transfer agent in atomic reactors.
The chemical molecular formula of superheavy water is T2O. Each heavy water molecule is composed of two tritium atoms and one oxygen atom. Superheavy water is extremely rare in natural water, with a proportion of less than one part per billion. The production cost of super heavy water is tens of thousands of times higher than that of heavy water.
The chemical formula of deuterated water is HDO. Each molecule contains one hydrogen atom, one deuterium atom and one oxygen atom. Not much use.
In addition, water also includes sweat, salt water, urine, distilled water, etc.