Question

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

Answer 1

Hint: Liquid don’t have a definite shape, and they can flow because the particles are still packed close together whereas the liquid can’t easily be compressed and keep the same volume. Moreover in case of gas; the gas molecules are free to move in all directions.

Complete answer:
Yes, the liquid can flow.

Unlike the solids, the fluids (liquid and air) have the property which is called viscosity, further it is classified as the magnitude of internal friction of fluid.
The two factors that cause viscosity are; cohesive forces, momentum diffusion.
Important to remember not all liquids flow easily. The only liquid having high viscosity such as honey and mayonnaise are relatively difficult to flow.

NO, we can’t keep a particular gas in an open container because in an open container, the pressure becomes equal to atmospheric pressure and due to molecular dispersion, purity of that particular gas is reduced. Basically, a gas inside a closed container doesn’t necessarily experience atmospheric pressure. Did you ever notice how the shaken bottle pops up when you open the bottle cap, this is because the gas pressure inside is a lot higher than atmospheric pressure.

This is the best example to explain how the pressure inside the closed container is higher than atmospheric pressure, but it can be lower as well.

Note:
There are some facts about gases such as; pure gases are made up of just one atom whereas the compound gases contain the combination of different atoms, Gas is said to be a common state of matter like solids and liquids.