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Matter In Our Surroundings

Question
CBSEENSC9004670
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Why does evaporation causes cooling of a liquid system ?

Solution
Due to evaporation, only high energy particles leave the surface. This results in decrease of average kinetic energy of the particles in the system. The particle of liquid absorb energy from the surrounding to regain the energy lost during evapotation. This absorption of energy from the surroundings make the liquid cool.

Some More Questions From Matter In Our Surroundings Chapter

Convert the following temperature to Celsius scale.

300K

Convert the following temperature to Celsius scale.

573 K

Convert the following temperatures to Kelvin scale

25°C

What is the physical state of water at

100 °C

For any substance, why does the temperature remain constant during the change of state ?

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

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