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	<title>A Perfectly Normal Blog &#187; Tea</title>
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	<description>Just a scratchpad for thoughts, reflections, and stuff.</description>
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		<title>Measuring the Cool-off Effect of Water in Different Types of Containers</title>
		<link>http://www.gefvert.org/blog/archives/737</link>
		<comments>http://www.gefvert.org/blog/archives/737#comments</comments>
		<pubDate>Wed, 02 Dec 2009 16:25:54 +0000</pubDate>
		<dc:creator>Mats Gefvert</dc:creator>
				<category><![CDATA[McDonalds]]></category>
		<category><![CDATA[Tea]]></category>

		<guid isPermaLink="false">http://www.matsgefvert.se/blog/?p=737</guid>
		<description><![CDATA[The question was formed recently due to a conversation with a fellow tea-drinker. Does tea in a large cup cool off quicker &#8211; or slower &#8211; than in a small cup? I thought previously that the greater area in the &#8230; <a href="http://www.gefvert.org/blog/archives/737">Continue reading <span class="meta-nav">&#8594;</span></a>]]></description>
			<content:encoded><![CDATA[<p>The question was formed recently due to a conversation with a fellow tea-drinker. Does tea in a large cup cool off quicker &#8211; or slower &#8211; than in a small cup? I thought previously that the greater area in the larger teacup would cause a quicker cool-off than the small area of a smaller teacup. However, the volume is also larger, so how does that effect the cool-off?</p>
<p>One possible alternative is to consider the growth of area versus volume. Since area grows by O(n^2), but volume grows by O(n^3), it might seem that the larger the container, the more energy that needs to irradiate through a smaller area. In general, this theory holds with for instance animals &#8211; mice needs to eat much more often than elephants, because they have a much larger skin surface compared to their volume. An elephant the size of a mouse would die &#8211; it would never be able to feed itself quickly enough the replace the heat loss through the skin.</p>
<p>So, the following experiment was set up. Hot water at a starting temperature of 96 C was poured into different containers:</p>
<ul>
<li>Cup A &#8211; a small, paper cup for holding &#8220;Glögg&#8221;. Diameter 6cm, 1x water content.</li>
<li>Cup B &#8211; a large McDonalds coffee mug (official McD size: &#8220;medium&#8221;). Diameter 9cm, 2x water content.</li>
<li>Cup C &#8211; a medium-size ceramic coffee mug. Diameter 8cm, 1.3x water content.</li>
<li>Cup D &#8211; a large (=tall) glass. Diameter 7cm, 2x water content.</li>
</ul>
<p>Sample data was collected over 15 minutes using a steak thermometer. (Not the world&#8217;s most precise, mind you.)</p>
<p>The results are as follows (time is in UTC):</p>
<p><img src="http://www.matsgefvert.se/blog/wp-content/uploads/2009/12/water-cooloff-chart.png" alt="water-cooloff-chart" title="water-cooloff-chart" width="722" height="448"/></p>
<p>Surprisingly, the container that held its best was the McDonalds coffee mug. The water in the McDonalds mug was consistently hotter than in the others.</p>
<p>Not surprisingly, the small paper Glögg cup was a total failure &#8211; dropping down below the measurable 55 degrees Celsius on the steak thermometer, and had to be estimated to about 52.</p>
<p>Unfortunately, it seems that the data collected so far fails to support any conclusive theory. It seems to be largely dependent on the materials of the container, as well as &#8220;other factors&#8221;, not determined by this study.</p>
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		<title>Chamomile</title>
		<link>http://www.gefvert.org/blog/archives/281</link>
		<comments>http://www.gefvert.org/blog/archives/281#comments</comments>
		<pubDate>Mon, 20 Aug 2007 09:15:22 +0000</pubDate>
		<dc:creator>Mats Gefvert</dc:creator>
				<category><![CDATA[Reflections]]></category>
		<category><![CDATA[Tea]]></category>

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		<description><![CDATA[Chamomile tea is very good. I started drinking chamomile during a slight Chinese period of mine (it wasn&#8217;t anything as extensive as my military period). It&#8217;s a pity I don&#8217;t drink it more. Tea holds the same properties over coffee, &#8230; <a href="http://www.gefvert.org/blog/archives/281">Continue reading <span class="meta-nav">&#8594;</span></a>]]></description>
			<content:encoded><![CDATA[<p>Chamomile tea is very good. I started drinking chamomile during a slight Chinese period of mine (it wasn&#8217;t anything as extensive as my <a href="http://www.matsgefvert.se/blog/archives/category/military/">military</a> period). It&#8217;s a pity I don&#8217;t drink it more.</p>
<p>Tea holds the same properties over coffee, as cats do over dogs. It&#8217;s more subtle, quiet, distinguished. It doesn&#8217;t make a fuss, it&#8217;s got its own gentle character, and it bristles with class. Chamomile, while technically not a tea in itself &#8211; herbal teas are sometimes included among teas, sometimes not &#8211; exudes that same kind of distinguished charm.</p>
<p>There are two kinds of teas that go very well in a specific circumstance; and that&#8217;s when you sit on a balcony, or front porch, and watch the gentle summer rain. It&#8217;s warm, and there&#8217;s a quiet, sad tap-tap-tap on the roof from the rain drops, and a quiet splashing of the water trickling down the sides of the building and gently falling on the surroundings. And that&#8217;s when these two teas shine in all their glory. Number one, the chamomile; and number two, the <a href="http://en.wikipedia.org/wiki/Lapsang_souchong">lapsang souchong</a>.</p>
<p>Chamomile has a rather sharp, distinct herbal taste, and it is countered very well by the smoky, heavy flavor of the lapsang. As both have a very organic feel to it &#8211; very earthy, natural somehow &#8211; they are, in my opinion, ideally suited for this kind of activity: To gently sit and watch the rain fall while you&#8217;re immersed in quiet thoughts about life.</p>
<p>I&#8217;m sure you&#8217;ve all read the <a href="http://seikku.iki.fi/seikku/EnglishPaper.html">funny tandem writing story</a> where chamomile tea figures briefly.</p>
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