A basic experiment that shows why some volcanoes blow sky high

There are volcanoes all over the world , but while some filter out the side , some burst high into the sky . To find out why , you could do a demonstration in your own kitchen . If you have a mop .

There are a lot of factors that can lend to spend a penny a full - scale bang of a volcano alternatively of a boring dribble . The grade of pressure and the suddenness of the release contribute , of course , as does any other force put on to the extravasation . One of the main contributor to the height of an outbreak , though , is the consistency of the lava . The way it conduce may be counter - intuitive . It seems that a thin liquid will shoot out of a container higher and faster than a thicker and more viscous one , since the viscous one has molecules that will book together and resist movement by a force . compact a tube of water and the water will squirt far . compact a tube of molasses with the same amount of force and you wo n’t see the same amount of sputter .

But neither water nor molasses have compressed gaseous state inside them , and liquidity that ’s been trapped inside the ground for a long time does . That makes a huge difference , which we can see with a simple experimentation . snap up two nursing bottle of soda and flummox them both in the Deepfreeze for about a half minute . You want to get them extremely cold , but never cold enough to freeze . Next you ’ll require a parcel of wallpaper paste , or some other cloth that turns tonic exceedingly gummy . reach the sal soda bottles , and stream out a little soda from one – just enough to have space to pour the wallpaper library paste in . Close both . attempt to have as small carbon dioxide as you may out of each . ( You only launch the ‘ mastery ’ bottleful to make the experience of both bottle as similar as possible . ) Once the palpebra is on taut , it ’s time to shake ’em both up . Shake for a estimable foresightful time , until the spread is equally distributed in the first feeding bottle , and the liquid at bottom seems duncical and gluey .

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Now go out to you back grand , wearing something you do n’t care about , and let the bottle warm up a little . Once they ’re warm , take the top off of both bottle . The unconstipated soda will hit out of the feeding bottle . The gluey soda , though , will go much higher .

Why ? It seems like it ’s harder to move glue than it is washing soda . And it is harder . That ’s why the pin bubbles of carbon dioxide are under so much more pressure inside the gluey nursing bottle . The heaviness of the liquid , combined with the cramped conditions , compresses them into lilliputian point , much smaller than they would be in the regular soda . Once the liquid is free of the nursing bottle the pressure difference is so intense , and the balls have been compressed to be so gumptious , that they expand massively , shooting smooth mellow into the air . The regular washing soda bubble ca n’t vie with that kind of pressure difference , and so they do n’t force the liquid to go up as mellow .

In vent raw gas fill the magma under the open of the earth . The boneheaded the magma , the more the gasses are compressed , and the more problem they ’ll cause when the pressure of the dry land above them is released . Thin , fluid magma will flow , often quite fast , but thicker magma will make it more probable for a volcano to shoot lava into the air .

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