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Question

Liquids can flow. Why?
We can keep a gas in an open container. Do you agree? Given reason.

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Solution

Yes, the liquid can flow.

1.Unlike solids, fluids (liquids and air) have the property called viscosity which is defined as the magnitude of internal friction in a fluid.

2.The causes of viscosity are due to two factors: (i) cohesive forces; (ii) momentum diffusion.

3. Not all the liquids flow easily. Liquids with high viscosity, such as honey and mayonnaise, are relatively difficult to flow.

No, we can't keep a particular gas in an open container.in an open container, the pressure becomes equal to atmospheric pressure and due to molecular dispersion, purity of that particular gas reduced.

Actually, a gas inside a closed container doesn't necessarily experience atmospheric pressure. If you've ever shaken a bottle of pop then opened it you'll know that the gas pressure inside is a lot higher than atmospheric pressure. This is an example where the pressure inside the closed container is higher than atmospheric pressure, but it can be lower as well.


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