Question

d. Give reasons for the following
i. Gases and liquids can flow
ii. We see droplets of water outside the glass of chilled water.​

Answer 1

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Gases and liquids can flow

• For liquids and gases these particles can flow over or alongside one another. That is why liquids and gases are also called fluids: because they can flow. This flow can be smooth, chaotic or anything in between. A smooth flow is called laminar and its opposite is called a turbulent.

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We see droplets of water outside the glass of chilled water.

• In solids these particles hold on to one another tightly. For liquids and gases these particles can flow over or alongside one another. That is why liquids and gases are also called fluids: because they can flow. This flow can be smooth, chaotic or anything in between.

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Answer 2

Answer:

i. The molecules of liquids and gases are far apart i.e. have more gaps, intermolecular attraction force is very less as compared to solids, hence liquids and gases can flow but solids do not as gaps*in solid molecules is less and molecular force of attraction very strong.

ii. This phenomenon is known as condensation. Cold water inside the water tries to cool down The water vapor in air which comes in contact with wall of glass and due to low temperature the vapor liquid and appears as water droplets on the outside of glass.