e39465ad2f
new file: Files/flashplayer_32_sa.exe
new file: favicon.ico
new file: globe.gif
new file: imgs/download.png
new file: imgs/zuck.jpg
new file: index.html
new file: other.ico
new file: script.js
new file: site.webmanifest
new file: sitemap.html
new file: styles/backround.css
new file: styles/border.css
new file: styles/fonts/Titillium_Web/OFL.txt
new file: styles/fonts/Titillium_Web/TitilliumWeb-Black.ttf
new file: styles/fonts/Titillium_Web/TitilliumWeb-Bold.ttf
new file: styles/fonts/Titillium_Web/TitilliumWeb-BoldItalic.ttf
new file: styles/fonts/Titillium_Web/TitilliumWeb-ExtraLight.ttf
new file: styles/fonts/Titillium_Web/TitilliumWeb-ExtraLightItalic.ttf
new file: styles/fonts/Titillium_Web/TitilliumWeb-Italic.ttf
new file: styles/fonts/Titillium_Web/TitilliumWeb-Light.ttf
new file: styles/fonts/Titillium_Web/TitilliumWeb-LightItalic.ttf
new file: styles/fonts/Titillium_Web/TitilliumWeb-Regular.ttf
new file: styles/fonts/Titillium_Web/TitilliumWeb-SemiBold.ttf
new file: styles/fonts/Titillium_Web/TitilliumWeb-SemiBoldItalic.ttf
new file: styles/fonts/webfontkit-20221027-163353/generator_config.txt
new file: styles/fonts/webfontkit-20221027-163353/specimen_files/grid_12-825-55-15.css
new file: styles/fonts/webfontkit-20221027-163353/specimen_files/specimen_stylesheet.css
new file: styles/fonts/webfontkit-20221027-163353/stylesheet.css
new file: styles/fonts/webfontkit-20221027-163353/titilliumweb-extralight-demo.html
new file: styles/fonts/webfontkit-20221027-163353/titilliumweb-extralight-webfont.woff
new file: styles/fonts/webfontkit-20221027-163353/titilliumweb-extralight-webfont.woff2
new file: styles/fonts/webfontkit-20221027-165950/generator_config.txt
new file: styles/fonts/webfontkit-20221027-165950/specimen_files/grid_12-825-55-15.css
new file: styles/fonts/webfontkit-20221027-165950/specimen_files/specimen_stylesheet.css
new file: styles/fonts/webfontkit-20221027-165950/stylesheet.css
new file: styles/fonts/webfontkit-20221027-165950/titilliumweb-bold-demo.html
new file: styles/fonts/webfontkit-20221027-165950/titilliumweb-bold-webfont.woff
new file: styles/fonts/webfontkit-20221027-165950/titilliumweb-bold-webfont.woff2
new file: styles/style.css
new file: tools/2048/.gitignore
new file: tools/2048/.jshintrc
new file: tools/2048/CONTRIBUTING.md
new file: tools/2048/LICENSE.txt
new file: tools/2048/README.md
new file: tools/2048/Rakefile
new file: tools/2048/favicon.ico
new file: tools/2048/index.html
new file: tools/2048/js/animframe_polyfill.js
new file: tools/2048/js/application.js
new file: tools/2048/js/bind_polyfill.js
new file: tools/2048/js/classlist_polyfill.js
new file: tools/2048/js/game_manager.js
new file: tools/2048/js/grid.js
new file: tools/2048/js/html_actuator.js
new file: tools/2048/js/keyboard_input_manager.js
new file: tools/2048/js/local_storage_manager.js
new file: tools/2048/js/tile.js
new file: tools/2048/meta/apple-touch-icon.png
new file: tools/webretro/cores/neocd_libretro.js
new file: tools/webretro/cores/neocd_libretro.wasm
new file: tools/webretro/cores/nestopia_libretro.js
new file: tools/webretro/cores/nestopia_libretro.wasm
new file: tools/webretro/cores/o2em_libretro.js
new file: tools/webretro/cores/o2em_libretro.wasm
new file: tools/webretro/cores/opera_libretro.js
new file: tools/webretro/cores/opera_libretro.wasm
402 lines
14 KiB
HTML
402 lines
14 KiB
HTML
<!DOCTYPE html>
|
||
<html lang="en"><!-- #BeginTemplate "/Templates/Main.dwt" --><!-- DW6 -->
|
||
|
||
<!-- Mirrored from www.mathsisfun.com/temperature-conversion.html by HTTrack Website Copier/3.x [XR&CO'2014], Sat, 29 Oct 2022 00:36:33 GMT -->
|
||
<head>
|
||
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
|
||
|
||
|
||
|
||
|
||
<!-- #BeginEditable "doctitle" -->
|
||
<title>Conversion of Temperature - Celsius to Fahrenheit</title>
|
||
|
||
<link rel="stylesheet" type="text/css" href="stylejs.css">
|
||
<!-- #EndEditable -->
|
||
<meta name="keywords" content="math, maths, mathematics, school, homework, education">
|
||
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
|
||
<meta name="HandheldFriendly" content="true">
|
||
<meta name="referrer" content="always">
|
||
<link rel="preload" href="images/style/font-champ-bold.ttf" as="font" type="font/ttf" crossorigin="">
|
||
<link rel="preload" href="style4.css" as="style">
|
||
<link rel="preload" href="main4.js" as="script">
|
||
<link rel="stylesheet" href="style4.css">
|
||
<script src="main4.js" defer="defer"></script>
|
||
<!-- Global site tag (gtag.js) - Google Analytics -->
|
||
<script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-29771508-1"></script>
|
||
<script>
|
||
window.dataLayer = window.dataLayer || [];
|
||
function gtag(){dataLayer.push(arguments);}
|
||
gtag('js', new Date());
|
||
gtag('config', 'UA-29771508-1');
|
||
</script>
|
||
</head>
|
||
|
||
<body id="bodybg">
|
||
|
||
<div id="stt"></div>
|
||
<div id="adTop"></div>
|
||
<header>
|
||
<div id="hdr"></div>
|
||
<div id="tran"></div>
|
||
<div id="adHide"></div>
|
||
<div id="cookOK"></div>
|
||
</header>
|
||
|
||
<div class="mid">
|
||
|
||
<nav>
|
||
<div id="menuWide" class="menu"></div>
|
||
<div id="logo"><a href="index.html"><img src="images/style/logo.svg" alt="Math is Fun"></a></div>
|
||
|
||
<div id="search" role="search"></div>
|
||
<div id="linkto"></div>
|
||
|
||
<div id="menuSlim" class="menu"></div>
|
||
<div id="menuTiny" class="menu"></div>
|
||
</nav>
|
||
|
||
<div id="extra"></div>
|
||
|
||
<article id="content" role="main">
|
||
|
||
<!-- #BeginEditable "Body" -->
|
||
|
||
|
||
<h1 class="center">Conversion of Temperature</h1>
|
||
|
||
<h3>Quick Celsius (<strong>°C</strong>) / Fahrenheit (<strong>°F</strong>) Conversion:</h3><a name="tool" id="tool"></a>
|
||
<div style="float:left; margin: 0 10px 5px 0; width:210px;">
|
||
<div class="script" style="height: 560px;">
|
||
measure/images/thermometer.js?mode=boxes
|
||
</div>
|
||
</div>
|
||
<div>
|
||
<p>Type a value in either box</p>
|
||
<p> </p>
|
||
<p>Or use the slider</p>
|
||
<p>Or the <a href="measure/thermometer.html">Interactive Thermometer</a></p>
|
||
<p style="min-width:250px;">Or this method:</p>
|
||
<div class="simple">
|
||
|
||
<table style="border: 0; margin:auto;">
|
||
<tbody>
|
||
<tr>
|
||
<td style="text-align:center; width:80px;"><strong>°C to °F</strong></td>
|
||
<td>Divide by 5, then multiply by 9, then add 32</td>
|
||
</tr>
|
||
<tr>
|
||
<td style="text-align:center; width:80px;"><strong>°F to °C</strong></td>
|
||
<td>Deduct 32, then multiply by 5, then divide by 9</td>
|
||
</tr>
|
||
</tbody></table>
|
||
</div>
|
||
<p class="center">(<a href="#explanation">Explanation Below ...</a>)</p>
|
||
</div>
|
||
<div style="clear:both">
|
||
</div>
|
||
|
||
|
||
<h2>Typical Temperatures</h2>
|
||
|
||
<p>(only <b>bold</b> are exactly the same)</p>
|
||
<div class="simple">
|
||
|
||
<table style="border: 0; margin:auto;">
|
||
<tbody>
|
||
<tr>
|
||
<td align="center" width="40"> </td>
|
||
<th align="center" width="50">°C</th>
|
||
<th align="center" width="50">°F</th>
|
||
<th>Description</th>
|
||
</tr>
|
||
<tr>
|
||
<td bgcolor="#ff0000"> </td>
|
||
<td style="text-align:center;">220</td>
|
||
<td style="text-align:center;">430</td>
|
||
<td>Hot Oven</td></tr>
|
||
<tr>
|
||
<td bgcolor="#f62734"> </td>
|
||
<td style="text-align:center;">180</td>
|
||
<td style="text-align:center;">360</td>
|
||
<td>Moderate Oven</td>
|
||
</tr>
|
||
<tr>
|
||
<td bgcolor="#e4434d"> </td>
|
||
<td style="text-align:center;"><b>100</b></td>
|
||
<td style="text-align:center;"><b>212</b></td>
|
||
<td>Water boils</td>
|
||
</tr>
|
||
<tr>
|
||
<td bgcolor="#cf6269"> </td>
|
||
<td style="text-align:center;"><b>40</b></td>
|
||
<td style="text-align:center;"><b>104</b></td>
|
||
<td>Hot Bath</td>
|
||
</tr>
|
||
<tr>
|
||
<td bgcolor="#bd7e82"> </td>
|
||
<td style="text-align:center;"><b>37</b></td>
|
||
<td style="text-align:center;"><b>98.6</b></td>
|
||
<td>Body temperature</td>
|
||
</tr>
|
||
<tr>
|
||
<td bgcolor="#a89d9d"> </td>
|
||
<td style="text-align:center;"><b>30</b></td>
|
||
<td style="text-align:center;"><b>86</b></td>
|
||
<td> Beach weather</td>
|
||
</tr>
|
||
<tr>
|
||
<td bgcolor="#a4a3b0"> </td>
|
||
<td style="text-align:center;">21</td>
|
||
<td style="text-align:center;">70</td>
|
||
<td> Room temperature</td>
|
||
</tr>
|
||
<tr>
|
||
<td bgcolor="#a3b8c3"> </td>
|
||
<td style="text-align:center;"><b>10</b></td>
|
||
<td style="text-align:center;"><b>50</b></td>
|
||
<td> Cool Day</td>
|
||
</tr>
|
||
<tr>
|
||
<td bgcolor="#a3c5d7"> </td>
|
||
<td style="text-align:center;"><b>0</b></td>
|
||
<td style="text-align:center;"><b> 32</b></td>
|
||
<td> Freezing point of water</td>
|
||
</tr>
|
||
<tr>
|
||
<td bgcolor="#a3cfe7"> </td>
|
||
<td style="text-align:center;">−18</td>
|
||
<td style="text-align:center;">0</td>
|
||
<td>Very Cold Day</td>
|
||
</tr>
|
||
<tr>
|
||
<td bgcolor="#a2daf8"> </td>
|
||
<td style="text-align:center;"><b>−40</b></td>
|
||
<td style="text-align:center;"><b>−40</b></td>
|
||
<td> Extremely Cold Day<br>
|
||
(and the same number!)</td>
|
||
</tr>
|
||
</tbody></table>
|
||
</div>
|
||
|
||
<p style="float:left; margin: 0 10px 5px 0;"><img src="images/art/sage-pup-front.svg" alt="pup thinks"></p>
|
||
<h2>Some Tricks:</h2>
|
||
<p>Daily Temperatures: these three conversions "flip the digits" (accurate within 1°):</p>
|
||
<p class="center large">
|
||
<i>
|
||
°C °F<br>
|
||
28 ⇄ 82<br>
|
||
16 ⇄ 61<br>
|
||
04 ⇄ 40
|
||
|
||
</i></p>
|
||
|
||
|
||
<p>
|
||
Oven Temperatures: in the range 150 to 200 °C we can <b>double °C to get °F</b> (accurate within 8°F): </p>
|
||
<div class="simple">
|
||
|
||
|
||
<table class="center">
|
||
<tbody>
|
||
<tr>
|
||
<td>°C</td>
|
||
<td>°F<br>Estimate</td>
|
||
<td><i>°F<br>Actual</i></td></tr>
|
||
<tr>
|
||
<td>200</td>
|
||
<td>400</td>
|
||
<td><i>392</i></td></tr>
|
||
<tr>
|
||
<td>180</td>
|
||
<td>360</td>
|
||
<td><i>356</i></td></tr>
|
||
<tr>
|
||
<td>160</td>
|
||
<td>320</td>
|
||
<td><i>320</i></td></tr>
|
||
|
||
<tr>
|
||
<td>150</td>
|
||
<td>300</td>
|
||
<td><i>302</i></td></tr>
|
||
|
||
</tbody></table>
|
||
</div>
|
||
<p>
|
||
Going the other way: for the range 300 to 400 °F we can <b>halve °F to get °C</b> (accurate within 4°C).</p>
|
||
|
||
|
||
<h2>Explanation</h2>
|
||
|
||
<p>There are two main temperature scales:</p>
|
||
<ul>
|
||
<div class="bigul">
|
||
<li><strong>°C</strong>, the <b>Celsius Scale</b> (part of the Metric
|
||
System, used in most countries)</li>
|
||
<li><strong>°F</strong>, the <b>Fahrenheit Scale</b> (used in the US)</li>
|
||
</div>
|
||
</ul>
|
||
<p>They both measure the same thing (temperature!), but use different
|
||
numbers:</p>
|
||
<ul>
|
||
<li>Boiling water (at normal pressure) measures <b>100° in Celsius, but 212°
|
||
in Fahrenheit</b></li>
|
||
<li>And as water freezes it measures
|
||
<b>0° in Celsius, but 32° in Fahrenheit</b></li>
|
||
</ul>
|
||
<p>Like this:</p>
|
||
<p class="center"><img src="measure/images/temp-freeze-boil.svg" alt="temperature freeze (0 vs 32) and boil (100 vs 212)" height="400" width="360"></p>
|
||
<p>Looking at the diagram, notice:</p>
|
||
<ul>
|
||
<li>The scales start at a different number (0 vs 32), so we will
|
||
need to add or subtract 32</li>
|
||
<li>The scales rise at a different rate (100 vs 180), so we will
|
||
also need to multiply</li>
|
||
</ul>
|
||
<p>And so, to convert:</p>
|
||
<div class="so"> from Celsius to Fahrenheit:
|
||
first multiply by <span class="intbl"><em>180</em><strong>100</strong></span>, then add 32</div>
|
||
<div class="so"> from Fahrenheit to Celsius: first subtract 32, then multiply
|
||
by <span class="intbl"><em>100</em><strong>180</strong></span> </div>
|
||
<div class="clear"></div>
|
||
<p><span class="intbl"><em>180</em><strong>100</strong></span> can be simplified to <b><span class="intbl"><em>9</em><strong>5</strong></span></b>, and <span class="intbl"><em>100</em><strong>180</strong></span> can be simplified to <b><span class="intbl"><em>5</em><strong>9</strong></span></b>, so we get this:</p>
|
||
<div class="clear">
|
||
<div class="def center large">
|
||
<p><strong>°C to °F:</strong> Divide by 5, then multiply by 9, then add 32</p>
|
||
<p><strong>°F to °C:</strong> Subtract 32, then multiply by 5, then divide by 9</p>
|
||
</div>
|
||
</div><br>
|
||
<div class="example">
|
||
|
||
<h3>Example: Convert 25° Celsius <i>(a nice warm day)</i> to Fahrenheit</h3>
|
||
<p><i>First:</i> 25° / 5 = 5<br>
|
||
<i>Then:</i> 5 × 9 = 45<br>
|
||
<i>Then:</i> 45 + 32 = <b>77° F</b></p>
|
||
</div>
|
||
|
||
<div class="example">
|
||
|
||
<h3>Example: Convert 98.6° Fahrenheit <i>(normal body temperature)</i> to Celsius</h3>
|
||
<p><i>First:</i> 98.6° − 32 = 66.6<br>
|
||
<i>Then:</i> 66.6 × 5 = 333<br>
|
||
<i>Then:</i> 333 / 9 = <b> 37° C</b></p>
|
||
</div>
|
||
<p>We can swap the order of divide and multiply if we want, but don't change the add or subtract. So this is also OK:</p>
|
||
|
||
<div class="example">
|
||
|
||
<h3>Example: Convert 98.6° Fahrenheit to Celsius (again)</h3>
|
||
<p><i>First:</i> 98.6° − 32 = 66.6<br>
|
||
<i>Then:</i> 66.6 / 9 = 7.4<br>
|
||
<i>Then:</i> 7.4 × 5 = <b> 37° C</b></p><p>(Same answer as before, was it easier or harder this way?)</p>
|
||
</div>We can write them as formulas:
|
||
<div class="def center large">Celsius to Fahrenheit: (°C × <span class="intbl"><em>9</em><strong>5</strong></span>) + 32 = °F<br>
|
||
Fahrenheit to Celsius: (°F − 32) × <span class="intbl"><em>5</em><strong>9</strong></span> = °C
|
||
</div>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<h2>Other Methods That Work</h2>
|
||
|
||
<h3>Use 1.8 instead of 9/5</h3>
|
||
<p>9/5 is equal to 1.8, so we can also use this method:</p>
|
||
<div class="def center large">Celsius to Fahrenheit: °C × 1.8 + 32 = °F<br>
|
||
Fahrenheit to Celsius: (°F − 32) / 1.8 = °C</div>
|
||
<div class="simple"></div>
|
||
<p><br></p>
|
||
<p>To make "×1.8" easier we can <b>multiply by 2 and subtract 10%</b>, but it only works for °C to °F:</p>
|
||
<div class="def center large">Celsius to Fahrenheit: (°C × 2) less 10% + 32 = °F</div>
|
||
<div class="simple"></div>
|
||
|
||
<div class="example">
|
||
|
||
<h3>Example: Convert 20° Celsius <i>(A nice day)</i> to Fahrenheit</h3>
|
||
<ul>
|
||
<li><b>20</b>x2 = 40</li>
|
||
<li>less 10% is 40−4 = 36</li>
|
||
<li>36+32 = <b>68° F</b></li>
|
||
</ul>
|
||
</div>
|
||
<p> </p>
|
||
|
||
<h3>Add 40, Multiply, Subtract 40</h3>
|
||
<p>Since both scales cross at <b>−40°</b> (−40° C equals −40° F) we can:</p>
|
||
<ul>
|
||
<li>add 40,</li>
|
||
<li>multiply by 5/9 (for °F to °C), or 9/5 (for °C to °F)</li>
|
||
<li>subtract 40</li>
|
||
</ul>
|
||
<p>Like this:</p>
|
||
<div class="def center large">Celsius to Fahrenheit: Add 40, multiply by 9/5, then subtract 40<br>
|
||
Fahrenheit to Celsius: Add 40, multiply by 5/9, then subtract 40</div>
|
||
|
||
<div class="example">
|
||
|
||
<h3>Example: Convert 10° Celsius <i>(A cool day)</i> to Fahrenheit</h3>
|
||
<ul>
|
||
<li><b>10</b>+40 = 50</li>
|
||
<li>50×9/5 = 90</li>
|
||
<li>90−40 = <b>50° F</b></li>
|
||
</ul>
|
||
</div>
|
||
<p> </p>
|
||
|
||
<h3>Quick, but <b>Not Accurate</b></h3>
|
||
<div class="def center large">Celsius to Fahrenheit: Double, then add 30<br>
|
||
Fahrenheit to Celsius: Subtract 30, then halve</div>
|
||
<div class="simple"></div>
|
||
<p>Examples °C → °F:</p>
|
||
<ul>
|
||
<li><b>0° C</b> → 0+30 → <b>30° F</b> (low by 2°)</li>
|
||
<li><b>10° C</b> → 20+30 → <b>50° F</b> (exact!)</li>
|
||
<li><b>30° C</b> → 60+30 → <b>90° F</b> (high by 4°)</li>
|
||
<li><b>180° C</b> → 360+30 → <b>390° F</b> (high by 34°, not good)</li>
|
||
</ul>
|
||
<p>Examples °F → °C:</p>
|
||
<ul>
|
||
<li><b>40° F</b> → 10/2 → <b>5° C</b> (almost right)</li>
|
||
<li><b>80° F</b> → 50/2 → <b>25° C</b> (low by about 2°)</li>
|
||
<li><b>120° F</b> → 90/2 → <b>45° C</b> (low by about 4°)</li>
|
||
<li><b>450° F</b> → 420/2 → <b>210° C</b> (low by about 22°, not good)</li>
|
||
</ul>
|
||
<p> </p>
|
||
<div class="def">
|
||
<p style="float:right; margin: 0 0 5px 10px;"><img src="measure/images/temperature-particles.gif" alt="temperature particles" height="107" width="175"></p>
|
||
<p>Footnote: <b>Temperature</b> is a measure of how fast an object's particles are moving.</p>
|
||
</div>
|
||
<p> </p>
|
||
<div class="questions">1041, 1042, 1043, 1044, 3724, 3725, 3726, 3727, 3728, 3729</div>
|
||
|
||
<div class="related">
|
||
<a href="measure/thermometer.html">Interactive Thermometer</a>
|
||
<a href="metric-imperial-conversion-charts.html">Metric - Imperial Conversion Charts</a>
|
||
<a href="imperial-metric-conversion.html">How to Convert Imperial to Metric</a>
|
||
<a href="metric-imperial-conversion.html">How to Convert Metric to Imperial</a>
|
||
<a href="unit-conversion-tool.html">Unit Converter</a>
|
||
<a href="measure/index.html">Measurement Index</a>
|
||
</div>
|
||
<!-- #EndEditable -->
|
||
|
||
</article>
|
||
|
||
<div id="adend" class="centerfull noprint"></div>
|
||
<footer id="footer" class="centerfull noprint"></footer>
|
||
<div id="copyrt">Copyright © 2022 Rod Pierce</div>
|
||
|
||
</div>
|
||
</body><!-- #EndTemplate -->
|
||
<!-- Mirrored from www.mathsisfun.com/temperature-conversion.html by HTTrack Website Copier/3.x [XR&CO'2014], Sat, 29 Oct 2022 00:36:33 GMT -->
|
||
</html> |