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Getting Sauce out of the Bottle

Why does a bottle of tomato sauce have to be shaken vigorously to make the sauce flow out?

Some liquids are like a jelly until they are disturbed or forced to move. Then they flow freely. The faster they are made to move, the faster they flow. There's a name for such liquids. They are called thixotropic. Tomato sauce is thixotropic. When you shake the bottle vigorously or hit the sides, the sauce becomes less firm and starts flowing.
Some paints are thixotropic. They do not drip when they are on the brush but when they are moved along the surface of the wall with the brush, they become slippery liquids.
Thixotropic liquids are found in nature too. Quicksand is one example. The more one struggles in quicksand the less firm it becomes, and the victim is eventually drowned.

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Dimdima is the Sanskrit word for ‘drumbeat’. In olden days, victory in battle was heralded by the beat of drums or any important news to be conveyed to the people used to be accompanied with drumbeats.

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Bharatiya Vidya Bhavan
K. M Munshi Marg,
Chowpatty, Mumbai - 40 007
email : editor@dimdima.com

Dimdima Magazine

Bharatiya Vidya Bhavan
505, Sane Guruji Marg,
Tardeo, Mumbai - 40 034
email : promo@dimdima.com

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Dimdima.com, the Children's Website of Bharatiya Vidya Bhavan launched in 2000 and came out with a Printed version of Dimdima Magazine in 2004. At present the Printed Version have more than 35,000 subscribers from India and Abroad.

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