<p>When using in maths, we say:<br/>
<strong><em>x</em></strong> 的平方 (or, <strong><em>x</em></strong> 的二次方, alternatively): The square of <strong><em>x</em></strong><br/>
<strong><em>x</em></strong> 的立方 (or, <strong><em>x</em></strong> 的三次方, alternatively): The cube of <strong><em>x</em></strong><br/>
<strong><em>x</em></strong> 的 <strong><em>n</em></strong> 次方: The <strong><em>n</em></strong>-th power of <strong><em>x</em></strong><br/>
<strong><em>x</em></strong> 的平方根 (or, <strong><em>x</em></strong> 的二次方根, alternatively): The square root of <strong><em>x</em></strong><br/>
<strong><em>x</em></strong> 的立方根 (or, <strong><em>x</em></strong> 的三次方根, alternatively): The cube root of <strong><em>x</em></strong><br/>
<strong><em>x</em></strong> 的 <strong><em>n</em></strong> 次方根: The <strong><em>n</em></strong>-th root of <strong><em>x</em></strong><br/></p>

<p>When using in units in daily life, we say:<br/>
using 平方米 (or 平米) frequently rather than 二次方米 for <strong>square meters</strong>.<br/>
using 二次方秒 frequently rather than 平方秒 for <strong>square seconds</strong>.<br/></p>

<p>I thinks it is because of that 平 means <strong>flat</strong> literally in Chinese, 平方 means <strong>flat square</strong> literally, maybe the word 平方 was created to describe the area size at first (actually it is the same like that the word <strong>square</strong> in English). When referring to the square of time units, people prefer 二次方 instead of 平方.</p>

CC BY-SA 4.0
2019-02-26T05:07:49.377Z
2019-02-26T05:07:49.377Z
xenophōn
<p>I think you don't bother to find what's correct, both 米每二次方秒 and 米每平方秒 are understandable.</p>

<p>Basically, <strong>there are some statute describe the general rule for unit pronounciation</strong> . But I can't find the data source, so I don't post the rule here. </p>

<p>My rule is, just like in english, read all <code>x³</code> to <code>立方x</code>, all <code>xᒾ</code> to <code>平方x</code> <strong>expect <code>/sᒾ</code></strong> . </p>

<p>For example read </p>

<pre><code>kg/m³
kg        /     m³
千克      每    立方米
kilograms per cubic-meter 
</code></pre>

<p>In most cases $ x \in {m,cm,mm,s}$, if oneday I have to read the gravitational constant G(6.67E-11 N*mᒾ/kgᒾ), I most probably read 每平方千克.</p>

<p><strong>Below</strong> are reasons why "米每二次方秒" more common than "米每平方秒"(from the perspective of Bayesian inference.) I think it's just a convention. It's a huge project to find exactly why.
For the pronunciations of other common units, you can also find them in my links.</p>

<hr>

<h2>Statute law</h2>

<p>It shows there are only one correct pronunciation.</p>

<ol>
<li>中华人民共和国国务院公报 page 572 <a href="http://www.gov.cn/gongbao/shuju/1981/gwyb198118.pdf" rel="nofollow noreferrer">中华人民共和国计量单位名称与符号方案</a>  from 中国政府</li>
<li><a href="http://fgcx.bjcourt.gov.cn:4601/law?fn=chl005s160.txt" rel="nofollow noreferrer">中华人民共和国计量单位名称与符号方案（试行）</a> from 北京法院法规检索</li>
<li>《中华人民共和国法定计量单位使用方法》 , it is hosted on serveral unofficial web, I cannot find an official site.</li>
</ol>

<h2>Publication</h2>

<p>This solved your question of "中国数学家" .</p>

<ol>
<li><a href="https://books.google.com.sg/books?id=ze8LkTwSczcC" rel="nofollow noreferrer">大学物理(高等院校物理系列教材)</a></li>
<li><a href="http://222.197.182.67:1168/fl/fl.cbs?viewvalue=%B3%A3%D3%C3%B7%C7%B7%A8%B6%A8%BC%C6%C1%BF%B5%A5%CE%BB%D3%EB%B7%A8%B6%A8%BC%C6%C1%BF%B5%A5%CE%BB%B5%C4%B6%D4%D5%D5%BC%B0%BB%BB%CB%E3%B1%ED" rel="nofollow noreferrer">常用非法定计量单位与法定计量单位的对照及换算表</a> from 中国大百科全书数据库
&amp; <a href="http://scholar.jxlib.gov.cn/refbook/ShowDetail.aspx?Table=CRFDOTHERINFO&amp;ShowField=Content&amp;TitleField=Title-ShowTitle&amp;Field=OTHERID&amp;Value=R20110930400A000005" rel="nofollow noreferrer">附录二 非法定计量单位与法定计量单位换算表</a> from CNKI jiangxi</li>
</ol>

<h2>Web data</h2>

<p>This solve "the most common" problem.</p>

<p>Use double quotation marks and search by yourself to see what use them!
One publication only has one form</p>

<ol>
<li>google books ( 194 compared to 9 )</li>
<li>google scholar ( 14 compared to 2 )</li>
<li>google result (15700 compared to 4960)</li>
</ol>

<p>Don't use baidu, the result include "米每二次方秒" and "米每平方秒" even if you use double quotation marks.</p>

<h2>Argument against</h2>

<p>baike</p>

<p><a href="https://baike.baidu.com/item/%E7%B1%B3%E6%AF%8F%E5%B9%B3%E6%96%B9%E7%A7%92" rel="nofollow noreferrer">米每平方秒</a>
<a href="https://baike.baidu.com/item/%E5%8A%A0%E9%80%9F%E5%BA%A6/3764#viewPageContent" rel="nofollow noreferrer">加速度(米每二次方秒)</a></p>

<pre><code>see the link above, it's self-contradictory. 
Due to web incompatibility, I can't amend it. 
Also, the *former* baike article don't have source material.
</code></pre>

<p><s>google translate</s> </p>

<pre><code>`Metre per second squared` -&gt; `米每秒平方`
`米每二次方秒`-&gt;`Meter every second second`
`米每平方秒`-&gt;`Meter per square second`
</code></pre>

<p><s>Baidu translate </s></p>

<pre><code>`Metre per second squared`-&gt;`米/秒平方`
`米每二次方秒` -&gt; `Metre every second square second`
`米每平方秒` -&gt; `Metres per square second`
</code></pre>

<h2>Others</h2>

<p>FWIW, believe <a href="https://zh.wikipedia.org/wiki/%E7%B1%B3%E6%AF%8F%E4%BA%8C%E6%AC%A1%E6%96%B9%E7%A7%92" rel="nofollow noreferrer">Wikipedia</a>, when can't find in Wiki then use baike.</p>

CC BY-SA 4.0
2019-02-22T22:30:04.833Z
2019-03-12T15:46:13.543Z
2019-03-12T15:46:13.543Z
Voyager
<p>As for mathematical formula <code>x²</code>, it can be pronounced as either</p>

<blockquote>
  <p>X的二次方 (x to the power of two)</p>
</blockquote>

<p>or</p>

<blockquote>
  <p>X的平方 (x squared)</p>
</blockquote>

<hr>

<p>As for mathematical formula <code>x³</code>, it can be pronounced as either</p>

<blockquote>
  <p>X的三次方 (x to the power of three)</p>
</blockquote>

<p>or</p>

<blockquote>
  <p>X的立方 (x cubed)</p>
</blockquote>

<hr>

<p>As for mathematical formula <code>x⁴</code>, it can only be pronounced as:</p>

<blockquote>
  <p>X的四次方 (x to the power of four)</p>
</blockquote>

<hr>

<p>As for the unit of area “square metre” (<code>m²</code>), it is often pronounced as:</p>

<blockquote>
  <p>平方米</p>
</blockquote>

<hr>

<p>However, as for the unit of acceleration “metre per second squared” (<code>m/s²</code>), it is usually pronounced as:</p>

<blockquote>
  <p>米每二次方秒</p>
</blockquote>

<p>It is mainly because 平方秒 (square second, <code>s²</code>) <em>per se</em> does not make much sense. Nothing is measured in square seconds.</p>

<hr>

<p>In contrast, as for the unit of the current density “ampere per square metre” (<code>A/m²</code>), it is usually pronounced as:</p>

<blockquote>
  <p>安培每平方米</p>
</blockquote>

<p>Because 平方米 (square metre, <code>m²</code>) <em>per se</em> makes sense. Area can be measured in square metres.</p>

CC BY-SA 4.0
2019-03-12T15:41:41.790Z
Well, How do you pronounce the gravitational constant G? `/kgᒾ` don't make sense.
Voyager
CC BY-SA 4.0
2019-03-13T01:15:55.027Z
@rambler  6.67408×10⁻¹¹  牛顿平方米每二次方千克
Victor
CC BY-SA 4.0
2019-03-12T13:54:26.967Z
2019-03-13T01:20:00.923Z
2019-03-13T01:20:00.923Z
Victor
<p>二次方 or 平方 is the only way. Maybe scientists would change the expression to be more easy to speak in his language. </p>

<p>m/s^2 ->  n/s (n = √m)</p>

<p>I am not sure if they will do that, I have never seen something like x/y^2, maybe.</p>

CC BY-SA 4.0
2019-02-25T11:41:54.083Z
Any example for m/s^2 -> n/s (n = √m)? It 's incomprehensible.
Voyager
CC BY-SA 4.0
2019-02-25T11:51:01.020Z
@rambler Sorry, if it is fault , my idea XD
sfy
CC BY-SA 4.0
2019-02-25T11:33:54.790Z
2019-02-25T11:33:54.790Z
sfy
<p><code>二次方X</code> is not used commonly, though people may still understand what you are indicating.</p>

<p><strong>For numbers:</strong> </p>

<p>You can say <code>X(的)二次方</code> (not common)</p>

<p>or <code>X(的)平方</code></p>

<p>or <code>X(的)立方</code> (3rd power)</p>

<p>or <code>X的n次方</code> (nth power, n > 3)</p>

<p>where <code>(的)</code> can be skipped.</p>

<p><strong>For units:</strong></p>

<p>You can say <code>平方X</code> (2nd power)</p>

<p>or <code>立方X</code> (3rd power)</p>

<p>or <code>n次方X</code> (nth power, n>3)</p>

<p>so for your example: m/s^2, most common way to say is <code>米每平方秒</code>.</p>

CC BY-SA 4.0
2019-02-22T18:21:27.913Z
most common way to say is absolutely `米每二次方秒` 1.wiki https://zh.wikipedia.org/wiki/%E7%B1%B3%E6%AF%8F%E4%BA%8C%E6%AC%A1%E6%96%B9%E7%A7%92 2.online search result in baidu 3. my experience
Voyager
CC BY-SA 4.0
2019-02-22T19:34:24.023Z
@rambler I wouldn't say `absolutely` in any terms about Chinese unless I know everywhere in China is using exactly same term. Worth mentioning that wiki isn't widely used in China (especially in main land). Also I am not sure what term you put into [baidu translate](https://fanyi.baidu.com/#en/zh/meter%20per%20square%20second), but [Baidu encyclopedia did use 米每平方秒 as their entity title](https://baike.baidu.com/item/%E7%B1%B3%E6%AF%8F%E5%B9%B3%E6%96%B9%E7%A7%92). And through my 14 years of standard education in China mainland I've never speak the term in way of 米每二次方秒.
tweray
CC BY-SA 4.0
2019-02-22T20:17:20.023Z
Perhaps it's the false memory phenomenon. Absolutely means in my memory, it's absolutely. I can't recall anyone ever having said 米每平方秒 before. Now I will revoke my downvote anyway. And the Baidu Encyclopedia isn't authoritative at all, just now, when I publish my article of "米每二次方秒", the button is useless because the website isn't compatible with chrome. You also know baike is not objective under the control of CCP. The editor is also not good enough, in my wiki experience. Even now the the baike page has symbol error in your paste link and the link in the edit guide of baike is also broken.
Voyager
CC BY-SA 4.0
2019-02-22T20:21:32.583Z
@rambler srsly I don't think there's any meaning for CCP to control how people speak `meter per square second`. And just a reminder wikipedia is never authoritative, it's also maintained by community, and wiki community is much less popular than baidu community in China. If you feel necessary I believe you can try find the best reference from Chinese math text book. I personally won't bother doing that. Since OP is only asking for most **common** way to speak in **China**, I just provided the most common way from my experience and education in China.
tweray
CC BY-SA 4.0
2019-02-22T13:55:29.257Z
2019-02-22T18:08:47.197Z
2019-02-22T18:08:47.197Z
tweray
<p>In English it's much more common to say "squared" than "to the second power", but the reverse seems to be true in Chinese.  For example, m/s^2 is more commonly 米每二次方秒 (according to Google searches) than 米每秒的平方.  Does this match sound right to 中国数学家?</p>

CC BY-SA 4.0
2019-02-22T10:39:08.530Z
@rambler Please write an answer instead of leaving comments, seeing as you are answering the question.
Mou某
CC BY-SA 4.0
2019-03-13T04:10:15.087Z
As the unit for acceleration, m/s^2 is often read as "米每秒每秒". As it means the change of speech (whose unit is 米每秒) per second (每秒). This would not apply to other units with ^n.
fefe
<word-choice>
More common way to say "squared", 二次方X or X的平方？
# More common way to say "squared", 二次方X or X的平方？

(Asked by: username_0 on 2019-02-22)

In English it's much more common to say "squared" than "to the second power", but the reverse seems to be true in Chinese. For example, m/s^2 is more commonly 米每二次方秒 (according to Google searches) than 米每秒的平方. Does this match sound right to 中国数学家?

**Tags:** word-choice

> **Comments:**
> **username_1**: @rambler Please write an answer instead of leaving comments, seeing as you are answering the question.  
> **username_2**: As the unit for acceleration, m/s^2 is often read as "米每秒每秒". As it means the change of speech (whose unit is 米每秒) per second (每秒). This would not apply to other units with ^n.  

---

## 5 answers

### Answer by username_3 on 2019-02-26. Score: 2 | Accepted answer

When using in maths, we say:  
***x*** 的平方 (or, ***x*** 的二次方, alternatively): The square of ***x***  
***x*** 的立方 (or, ***x*** 的三次方, alternatively): The cube of ***x***  
***x*** 的 ***n*** 次方: The ***n***-th power of ***x***  
***x*** 的平方根 (or, ***x*** 的二次方根, alternatively): The square root of ***x***  
***x*** 的立方根 (or, ***x*** 的三次方根, alternatively): The cube root of ***x***  
***x*** 的 ***n*** 次方根: The ***n***-th root of ***x***

When using in units in daily life, we say:  
using 平方米 (or 平米) frequently rather than 二次方米 for **square meters**.  
using 二次方秒 frequently rather than 平方秒 for **square seconds**.

I thinks it is because of that 平 means **flat** literally in Chinese, 平方 means **flat square** literally, maybe the word 平方 was created to describe the area size at first (actually it is the same like that the word **square** in English). When referring to the square of time units, people prefer 二次方 instead of 平方.


---

### Answer by username_4 on 2019-02-22. Score: 3

I think you don't bother to find what's correct, both 米每二次方秒 and 米每平方秒 are understandable.
Basically, there are some statute describe the general rule for unit pronounciation . But I can't find the data source, so I don't post the rule here. 
My rule is, just like in english, read all x³ to 立方x, all xᒾ to 平方x expect /sᒾ . 
For example read 
kg/m³
kg        /     m³
千克      每    立方米
kilograms per cubic-meter 

In most cases $ x \in {m,cm,mm,s}$, if oneday I have to read the gravitational constant G(6.67E-11 N*mᒾ/kgᒾ), I most probably read 每平方千克.
Below are reasons why "米每二次方秒" more common than "米每平方秒"(from the perspective of Bayesian inference.) I think it's just a convention. It's a huge project to find exactly why.
For the pronunciations of other common units, you can also find them in my links.

Statute law
It shows there are only one correct pronunciation.

中华人民共和国国务院公报 page 572 中华人民共和国计量单位名称与符号方案  from 中国政府
中华人民共和国计量单位名称与符号方案（试行） from 北京法院法规检索
《中华人民共和国法定计量单位使用方法》 , it is hosted on serveral unofficial web, I cannot find an official site.

Publication
This solved your question of "中国数学家" .

大学物理(高等院校物理系列教材)
常用非法定计量单位与法定计量单位的对照及换算表 from 中国大百科全书数据库
& 附录二 非法定计量单位与法定计量单位换算表 from CNKI jiangxi

Web data
This solve "the most common" problem.
Use double quotation marks and search by yourself to see what use them!
One publication only has one form

google books ( 194 compared to 9 )
google scholar ( 14 compared to 2 )
google result (15700 compared to 4960)

Don't use baidu, the result include "米每二次方秒" and "米每平方秒" even if you use double quotation marks.
Argument against
baike
米每平方秒
加速度(米每二次方秒)
see the link above, it's self-contradictory. 
Due to web incompatibility, I can't amend it. 
Also, the *former* baike article don't have source material.

google translate 
`Metre per second squared` -> `米每秒平方`
`米每二次方秒`->`Meter every second second`
`米每平方秒`->`Meter per square second`

Baidu translate 
`Metre per second squared`->`米/秒平方`
`米每二次方秒` -> `Metre every second square second`
`米每平方秒` -> `Metres per square second`

Others
FWIW, believe Wikipedia, when can't find in Wiki then use baike.


---

### Answer by username_5 on 2019-03-12. Score: 1

As for mathematical formula `x²`, it can be pronounced as either

> X的二次方 (x to the power of two)

or

> X的平方 (x squared)

---

As for mathematical formula `x³`, it can be pronounced as either

> X的三次方 (x to the power of three)

or

> X的立方 (x cubed)

---

As for mathematical formula `x⁴`, it can only be pronounced as:

> X的四次方 (x to the power of four)

---

As for the unit of area “square metre” (`m²`), it is often pronounced as:

> 平方米

---

However, as for the unit of acceleration “metre per second squared” (`m/s²`), it is usually pronounced as:

> 米每二次方秒

It is mainly because 平方秒 (square second, `s²`) *per se* does not make much sense. Nothing is measured in square seconds.

---

In contrast, as for the unit of the current density “ampere per square metre” (`A/m²`), it is usually pronounced as:

> 安培每平方米

Because 平方米 (square metre, `m²`) *per se* makes sense. Area can be measured in square metres.

> **Comments:**
> **username_4**: Well, How do you pronounce the gravitational constant G? `/kgᒾ` don't make sense.  
> **username_5**: @rambler  6.67408×10⁻¹¹  牛顿平方米每二次方千克  

---

### Answer by username_6 on 2019-02-25. Score: 0

二次方 or 平方 is the only way. Maybe scientists would change the expression to be more easy to speak in his language.

m/s^2 -> n/s (n = √m)

I am not sure if they will do that, I have never seen something like x/y^2, maybe.

> **Comments:**
> **username_4**: Any example for m/s^2 -> n/s (n = √m)? It 's incomprehensible.  
> **username_6**: @rambler Sorry, if it is fault , my idea XD  

---

### Answer by username_7 on 2019-02-22. Score: 0

`二次方X` is not used commonly, though people may still understand what you are indicating.

**For numbers:**

You can say `X(的)二次方` (not common)

or `X(的)平方`

or `X(的)立方` (3rd power)

or `X的n次方` (nth power, n > 3)

where `(的)` can be skipped.

**For units:**

You can say `平方X` (2nd power)

or `立方X` (3rd power)

or `n次方X` (nth power, n>3)

so for your example: m/s^2, most common way to say is `米每平方秒`.

> **Comments:**
> **username_4**: most common way to say is absolutely `米每二次方秒` 1.wiki https://zh.wikipedia.org/wiki/%E7%B1%B3%E6%AF%8F%E4%BA%8C%E6%AC%A1%E6%96%B9%E7%A7%92 2.online search result in baidu 3. my experience  
> **username_7**: @rambler I wouldn't say `absolutely` in any terms about Chinese unless I know everywhere in China is using exactly same term. Worth mentioning that wiki isn't widely used in China (especially in main land). Also I am not sure what term you put into [baidu translate](https://fanyi.baidu.com/#en/zh/meter%20per%20square%20second), but [Baidu encyclopedia did use 米每平方秒 as their entity title](https://baike.baidu.com/item/%E7%B1%B3%E6%AF%8F%E5%B9%B3%E6%96%B9%E7%A7%92). And through my 14 years of standard education in China mainland I've never speak the term in way of 米每二次方秒.  
> **username_4**: Perhaps it's the false memory phenomenon. Absolutely means in my memory, it's absolutely. I can't recall anyone ever having said 米每平方秒 before. Now I will revoke my downvote anyway. And the Baidu Encyclopedia isn't authoritative at all, just now, when I publish my article of "米每二次方秒", the button is useless because the website isn't compatible with chrome. You also know baike is not objective under the control of CCP. The editor is also not good enough, in my wiki experience. Even now the the baike page has symbol error in your paste link and the link in the edit guide of baike is also broken.  
> **username_7**: @rambler srsly I don't think there's any meaning for CCP to control how people speak `meter per square second`. And just a reminder wikipedia is never authoritative, it's also maintained by community, and wiki community is much less popular than baidu community in China. If you feel necessary I believe you can try find the best reference from Chinese math text book. I personally won't bother doing that. Since OP is only asking for most **common** way to speak in **China**, I just provided the most common way from my experience and education in China.  

---

