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प्रश्न
Name the phenomenon which causes the following changes:
Formation of water vapour from water
उत्तर
vaporisation
APPEARS IN
संबंधित प्रश्न
Suggest a method to liquefy atmospheric gases.
Why is ice at 273 K more effective in cooling than water at the same temperature?
What do you understand by the term 'latent heat' ? What are the two types of latent heat ?
Which contains more heat, 1 kg of water at 100° C or 1 kg of steam at 100° C ? Give reason for your answer.
Why does a desert cooler cool better on a hot, dry day ?
What is sublimation ? Name two substances (other than ammonium chloride) which undergo sublimation.
Which of the following process/processes release heat ?
- condensation
- vaporisation
- freezing
- melting
Fill in the blanks:
The molecules are at a greater distance in ______ compared to liquids.
State which of the following statement is true or false. If false write the correct statement.
Atoms/molecules in gases move only about their own positions.
Prepare a model to demonstrate movement of particles in solids, liquids and gases.
For making this model you will need
- A transparent jar
- A big rubber balloon or piece of stretchable rubber sheet
- A string
- Few chickpeas or black gram or dry green peas.
How to make?
- Put the seeds in the jar.
- Sew the string to the centre of the rubber sheet and put some tape to keep it tied securely.
- Stretch and tie the rubber sheet on the mouth of the jar.
- Your model is ready. Now run your fingers up and down the string by first tugging at it slowly and then rapidly.
