<html xmlns="http://www.w3.org/1999/xhtml"><head></head><body><p><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="5" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[5]</anchor-end> <dfn><ruby>気<rt>き</rt></ruby><ruby>体<rt>たい</rt></ruby><ruby>定<rt>てい</rt></ruby><ruby>数<rt>すう</rt></ruby></dfn>は、
<anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">熱力学</anchor>における<anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">定数</anchor>です。記号 <dfn><var><anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">R</anchor></var></dfn>
で表します。</p><section><h1>記号</h1><figure class="quote"><figcaption><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="8" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[8]</anchor-end> <cite xml:lang="ja"><anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">気体定数</anchor> - Wikipedia</cite>
( (<time>2017-06-13 17:42:05 +09:00</time>))
<anchor-external xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resScheme="URI" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resParameter="https://ja.wikipedia.org/wiki/%E6%B0%97%E4%BD%93%E5%AE%9A%E6%95%B0">https://ja.wikipedia.org/wiki/%E6%B0%97%E4%BD%93%E5%AE%9A%E6%95%B0</anchor-external></figcaption><blockquote><p>R の由来は明確ではないが、「定数」を意味する ラテン語: Ratio が由来であるとする説もある</p></blockquote></figure></section><section><h1>気体定数の値</h1><p><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="6" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[6]</anchor-end> <anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">気体定数</anchor> <var>R</var> は、次の値です。</p><figure class="math"><p><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="1" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[1]</anchor-end> <var>R</var> = 0.082 [ℓ・atm/K/mol] = 8.31 [J/K/mol]</p></figure><p><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="4" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[4]</anchor-end> 気体定数 <var>R</var> は、<anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">標準状態</anchor>の<anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">気体</anchor>の<anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">体積</anchor> <n xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">22.4</n> [mol/ℓ]
と<anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">ボイル・シャルルの法則</anchor>から、<figure class="math"><p><var>R</var> = <mfrac xmlns="http://www.w3.org/1998/Math/MathML"><mtext> <var xmlns="http://www.w3.org/1999/xhtml">p</var><var xmlns="http://www.w3.org/1999/xhtml">V</var> </mtext><mtext> <var xmlns="http://www.w3.org/1999/xhtml">T</var> </mtext></mfrac> = <mfrac xmlns="http://www.w3.org/1998/Math/MathML"><mtext> <n xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">1.00</n> [atm] × <n xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">22.4</n> [ℓ/mol] </mtext><mtext> <n xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">273</n> [K] </mtext></mfrac> =
<n xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">0.082</n> [ℓ・atm/(K・mol)]</p></figure>... と求められます。</p></section><section><h1>関連</h1><p><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="9" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[9]</anchor-end> 
<anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">理想気体の状態方程式</anchor>も参照。</p><figure class="amazon"><p>熱力学</p></figure></section><section><h1>メモ</h1><refs xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:"><ul xmlns="http://www.w3.org/1999/xhtml"><li><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="2" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[2]</anchor-end> <cite xml:lang="ja"><anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">気体定数</anchor> - Wikipedia</cite> (<time>2013-07-23 12:58:12 +09:00</time> 版) <anchor-external xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resScheme="URI" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resParameter="http://ja.wikipedia.org/wiki/%E6%B0%97%E4%BD%93%E5%AE%9A%E6%95%B0">http://ja.wikipedia.org/wiki/%E6%B0%97%E4%BD%93%E5%AE%9A%E6%95%B0</anchor-external></li><li><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="3" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[3]</anchor-end> <cite>最近<anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">気体定数</anchor>が変わってる?: 技術屋さんの暇つぶし</cite> (<time>2013-07-31 17:41:57 +09:00</time> 版) <anchor-external xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resScheme="URI" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resParameter="http://glp.cocolog-nifty.com/blog/2013/05/post-6f04.html">http://glp.cocolog-nifty.com/blog/2013/05/post-6f04.html</anchor-external></li></ul></refs><p><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="7" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[7]</anchor-end> <cite xml:lang="ja"><anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">気体定数</anchor>は常に8.31として計算していいのでしょうか? - 気体定数は無次元数... - <anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">Yahoo!知恵袋</anchor></cite>
( (<time>2017-06-19 12:29:14 +09:00</time>))
<anchor-external xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resScheme="URI" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resParameter="https://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q1222366327">https://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q1222366327</anchor-external></p><p><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="10" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[10]</anchor-end> <cite>THE IDOLM@STER MillionRADIO - 2025/5/29(木) 21:00開始 - ニコニコ生放送</cite>
(<time>2025-05-30 20:34:08 +09:00</time>)
<anchor-external xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resScheme="URI" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resParameter="https://live.nicovideo.jp/watch/lv347531371">https://live.nicovideo.jp/watch/lv347531371</anchor-external></p></section></body></html>