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185 lines
7.9 KiB
HTML
185 lines
7.9 KiB
HTML
<!doctype html>
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<html lang="en"><!-- #BeginTemplate "/Templates/Main.dwt" --><!-- DW6 -->
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<!-- Mirrored from www.mathsisfun.com/measure/metric-mass.html by HTTrack Website Copier/3.x [XR&CO'2014], Sat, 29 Oct 2022 00:57:26 GMT -->
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<head>
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<meta http-equiv="content-type" content="text/html; charset=utf-8">
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<!-- #BeginEditable "doctitle" -->
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<title>Metric Mass (Weight)</title>
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<script language="JavaScript" type="text/javascript">reSpell=[["liter","litre"],["centimeter","centimetre"]];</script>
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<div id="logo"><a href="../index.html"><img src="../images/style/logo.svg" alt="Math is Fun"></a></div>
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<div id="content" role="main"><!-- #BeginEditable "Body" -->
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<h1 align="center">Metric Mass (Weight)</h1>
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<p><img src="images/set-weights.jpg" alt="set of weights" width="169" height="105" style="float:left; margin: 10px;" />
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</p>
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<p class="larger">Mass: how much matter is in an object. </p>
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<p><b>We measure mass by weighing</b>, but <a href="weight-mass.html">Weight and Mass</a> are not really the same thing. </p>
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<p> </p>
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<p>These are the most common measurements:</p>
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<div id="midul">
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<ul>
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<li><b>Grams</b></li>
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<li><b>Kilograms</b></li>
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<li><b>Tonnes</b></li>
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</ul></div>
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<p>Grams are the smallest, Tonnes are the biggest.</p>
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<p>Let’s take a few minutes and explore how heavy each of these are.</p>
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<h3>Grams<br />
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</h3>
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<table width="100%" border="0">
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<tr>
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<td width="14%"><img src="images/paperclip.jpg" alt="paperclip" width="86" height="86" /></td>
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<td width="86%"><p>A paperclip weighs about 1 gram. </p>
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<p>Hold one small paperclip in your hand. Does that weigh a lot? No! A gram is very light. That is why you often see things measured in hundreds of grams. </p></td>
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</tr>
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</table>
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<p>Grams are often written as <span class="large">g</span> (for short), so "300 g" means "300 grams".</p>
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<p>A loaf of bread weighs about 700 g (for a nice sized loaf)</p>
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<h3>Kilograms </h3>
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Once we have 1,000 grams, we have 1 <b>kilogram</b>.
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<table width="100%" border="0">
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<tr>
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<td width="91%"><p align="center" class="large">1 kilogram = 1,000 grams</p>
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<p align="right">A dictionary has a mass of about one kilogram.</p></td>
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<td width="9%"><img src="images/dictionary.jpg" alt="Dictionary" width="113" height="81" /></td>
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</tr>
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</table>
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<p style="float:left; margin: 0 10px 5px 0;"><img itemprop="image" src="images/gold-1kg.jpg" alt="1kg gold bar" width="220" height="212">
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</p>
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<p>This gold bar also has a mass of 1 kilogram.</p>
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<div style="clear:both"></div>
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<p>Kilograms are great for measuring things that can be lifted by people (sometimes very strong people are needed of course!). </p>
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<table width="100%" border="0">
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<tr>
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<td width="7%"><img src="images/bathroom-scales.jpg" alt="bathroom-scales" width="102" height="102" /></td>
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<td width="93%"><p>Kilograms are often written as <span class="large">kg</span> (that is a "k" for "kilo" and a "g" for "gram), so "10 kg" means "10 kilograms".</p>
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<p>Scales measure our weight using kilograms. An adult weighs about 70 kg. How much do you weigh?</p></td>
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</tr>
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</table>
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<p>But when it comes to things that are <b>very</b> heavy, we need to use the tonne.</p>
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<h3>Tonne<br />
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</h3>
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<p>Once we have 1,000 kilograms, we will have 1 tonne. </p>
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<p align="center" class="large">1 tonne = 1,000 kilograms </p>
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<table width="100%" border="0">
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<tr>
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<td><img src="images/car.jpg" alt="car" width="117" height="89" /></td>
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<td><p>Tonnes (also called Metric Tons) are used to measure things that are very heavy. </p>
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<p>Things like cars, trucks and large cargo boxes are weighed using the tonne. </p>
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<p>This car weighs about 2 tonnes.</p></td>
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</tr>
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</table>
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<p>Tonnes are often written as <span class="large">t</span> (for short), so "5 t" means "5 tonnes".</p>
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<p>Final thoughts about measuring weight:<br />
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</p>
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<div class="center80">
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<p align="center"><strong>1 kilogram = 1,000 grams</strong></p>
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<p align="center"><strong>1 tonne = 1,000 kilograms</strong></p>
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</div>
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<h2>Weight or Mass?</h2>
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<p>We have used the word "weight" only because that is <b>what people commonly say</b>.</p>
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<p align="center"><span class="larger">But we <b>really should say "Mass"</b>. See <a href="weight-mass.html">Weight or Mass</a> to learn more.</span></p>
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<h2>More Examples</h2>
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<p>A milligram is </p>
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<ul>
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<li>one-thousandth of a gram</li>
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<li>about the mass of a small grain of sand</li>
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<li>about the mass of a grain of salt</li>
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</ul>
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<p>A gram is about:</p>
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<ul>
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<li>a quarter of a teaspoon of sugar</li>
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<li>a cubic centimeter of water </li>
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<li>a paperclip </li>
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<li>a pen cap </li>
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<li>a thumbtack</li>
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<li>a pinch of salt</li>
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<li>a piece of gum</li>
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<li>the weight of any US bill </li>
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<li>one fifth of a piece of paper (80 gsm A4 paper weighs 4.8 g)</li><li>0.035274 of an ounce to 6 decimal places (we need 28.349523 grams to make an ounce) </li>
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</ul>
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<p>A kilogram is about:</p>
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<ul>
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<li>the mass of a liter bottle of water</li>
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<li>very close to <b>10% more than 2 pounds</b> (within a quarter of a percent)</li>
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<li>very very close to 2.205 pounds (accurate to 3 decimal places)</li>
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<li>7 apples</li>
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<li>a loaf and a half of bread </li>
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<li>about 2 packs of ground beef </li>
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</ul>
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<p> A tonne is about:</p>
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<ul>
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<li>the weight of a small car</li>
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</ul>
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<p> </p>
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<div class="questions">
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<script type="text/javascript">getQ(3634, 3635, 3636, 3637, 1923, 1924, 1925, 1926, 1006, 1007);</script>
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</div>
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<div class="related"> <a href="weight-mass.html">Weight and Mass</a> <a href="index.html">Measurement Index</a> </div>
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Copyright © 2019 MathsIsFun.com
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