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Matter In Our Surroundings

Question
CBSEENSC9004665
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How do you differentiate between a gas and a vapour ?

Solution

Vapour phase is not a state of matter. Vapour is a substance in the gas phase at a temperature lower than its critical point. it means that the vapour can be condensed to a liquid by increasing the pressure on it without reducing the temperature.

Gas is the state of matter distinguished from the solid and liquid state. Gas has relatively low density and viscosity, having great expansion and contraction which change with pressure and temperature.

Some More Questions From Matter In Our Surroundings Chapter

Suggest a method to liquify atmospheric gases.

Convert the following temperatures to Kelvin scale.

35°C

Give reason for the following observations.

Naphthalene balls disappear with time without leaving any solid.

Give reason for the following observations.

We can get the smell of perfume sitting several metres away.

What is the physical state of water at

a) 25°C
b)00C
c)1000C

What is the physical state of water at
0°C

What is the physical state of water at
100°C

Give two reasons to justify
Water at room temperature is a liquid.

Give two reasons to justify
An iron almirah is a solid at room temperature.

Why is ice at 273K more effective in cooling than water at the same temperature ?

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