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		<updated>2026-05-02T04:50:02Z</updated>
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	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=3240:_Bottle&amp;diff=411564</id>
		<title>3240: Bottle</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=3240:_Bottle&amp;diff=411564"/>
				<updated>2026-05-02T00:36:04Z</updated>
		
		<summary type="html">&lt;p&gt;AndyW: /* Explanation */&lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;{{comic&lt;br /&gt;
| number    = 3240&lt;br /&gt;
| date      = May 1, 2026&lt;br /&gt;
| title     = Bottle&lt;br /&gt;
| image     = bottle_2x.png&lt;br /&gt;
| imagesize = 581x235px&lt;br /&gt;
| noexpand  = true&lt;br /&gt;
| titletext = &amp;quot;I know it seems impossible, but the trick is that I sailed in here when I was very young.&amp;quot;&lt;br /&gt;
}}&lt;br /&gt;
&lt;br /&gt;
==Explanation==&lt;br /&gt;
{{incomplete|This page was bottled recently. Don't remove the cork too soon.}}&lt;br /&gt;
This comic shows a life sized ship in a bottle sailing along with other sail boats in the sea. The humor comes from the surreality of the situation.&lt;br /&gt;
&lt;br /&gt;
In this comic, [[Beret Guy]] is inside a {{w|Impossible bottle#Ship in a bottle|ship in a bottle}}. A common question when one sees one is &amp;quot;how was it put inside the bottle&amp;quot;, due to the small size of the opening in the bottle compared to the ship. The answer is that the ship was assembled (or at least partially unfolded, from more compact original components assembled outside) within the bottle. The title text alludes to this, by saying that Beret Guy grew up inside the bottle to fit (however, this is nonsensical, as he could likely fit into the bottle anyway, and ships do not grow as living things do).&lt;br /&gt;
&lt;br /&gt;
The water level in the bottle is lower than the water outside. This is because the bottle will sink until the weight of the bottle and its contents (the water, the boat, and [[Beret Guy]]) equals the weight of the water displaced by the bottle. The weight of the missing water in the bottle is consequently equal to the weight of the bottle, the boat, and [[Beret Guy]]. If you added water to the bottle in an attempt to make the inside and outside water levels the same, the bottle would just sink deeper. This would continue until the boyancy became less than zero at which point the bottle would sink.&lt;br /&gt;
&lt;br /&gt;
In practice, the bottle is horizontally unstable. The weight of the bottle is not equal along its length (it appears heavier at the neck), and the boyancy at each point will not equal the weight at that point. This is also true of the boats in the cartoon, the difference is that in the bottle much of the weight is the water which is free to move. If the neck of the bottle goes down (to increase the displacement to balance the weight), the water will move to the front of the bottle. This increases the weight at the front which will force the front even deeper. This will continue until the bottle is floating vertically. [[Beret Guy]]'s boat would appear to fit in the width of the bottle so everything will be fine. This effect (known as the 'free surface effect') has real implications for ships with open decks, such as car ferries, and has been implicated in several disasters such as the 'Herald of Free Enterprise', the 'Princes Victoria', and the 'Estonia'.&lt;br /&gt;
&lt;br /&gt;
==Transcript==&lt;br /&gt;
{{incomplete transcript|Don't remove this notice too soon.}}&lt;br /&gt;
&lt;br /&gt;
[Three small single-masted sailboats are shown, all sailing towards the right. The ones on the left and right are on the ocean, while the one in the middle is contained completely by a large bottle. On the left, Cueball and Megan are in one boat; Cueball is near the stern, possibly holding the tiller, while Megan is before the mast. In the middle, Beret Guy is before the mast in the boat that's inside the giant bottle, with a cork plugging the bottleneck. On the right, Ponytail is directly aft of the mast of the third boat. All the boats are sitting on the water with ripples on the surface, but the water level in the bottle is lower than the rest.]&lt;br /&gt;
&lt;br /&gt;
{{comic discussion}}&amp;lt;noinclude&amp;gt;&lt;br /&gt;
&lt;br /&gt;
[[Category:Comics featuring Cueball]]&lt;br /&gt;
[[Category:Comics featuring Megan]]&lt;br /&gt;
[[Category:Comics featuring Beret Guy]]&lt;br /&gt;
[[Category:Comics featuring Ponytail]]&lt;br /&gt;
[[Category:Strange powers of Beret Guy]]&lt;/div&gt;</summary>
		<author><name>AndyW</name></author>	</entry>

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