http://bigquestion.wordpress.com/2008/03/09/how-does-shaking-a-bottle-of-water-create-a-vacuum/ Site maintained by the British Association for the Advancement of Science Sat, 14 Nov 2009 13:04:12 +0000 http://wordpress.com/ hourly 1 http://bigquestion.wordpress.com/2008/03/09/how-does-shaking-a-bottle-of-water-create-a-vacuum/#comment-677 Neil Shirtcliffe Wed, 12 Mar 2008 18:10:39 +0000 http://bigquestion.wordpress.com/2008/03/09/how-does-shaking-a-bottle-of-water-create-a-vacuum/#comment-677 The temperature of the water will affect this one. Cold tap water is about 10 C, room air about 30 C. You trap them in a bottle and then cool the air to the temperature of the water by shaking it, gasses shrink a lot more than liquids when cooled so the contents shrink, reducing the pressure. If you use hot water the opposite happens, but do not do this as it is easy to burn yourself when you open the top and hot water squirts out. If you have small children and heat bottles you this is a common problem. The temperature of the water will affect this one. Cold tap water is about 10 C, room air about 30 C. You trap them in a bottle and then cool the air to the temperature of the water by shaking it, gasses shrink a lot more than liquids when cooled so the contents shrink, reducing the pressure. If you use hot water the opposite happens, but do not do this as it is easy to burn yourself when you open the top and hot water squirts out. If you have small children and heat bottles you this is a common problem.

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