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प्रश्न
Explain the term melting point
उत्तर
Matter can change from solid to liquid to the gaseous state and back to solid-state. This is called a change of state of matter.
Melting point — The constant temperature at which a solid melts into a liquid.
M.P. of ice – 0°C.
संबंधित प्रश्न
What is the physical state of water at 25°C.
A few substances are arranged in the increasing order of 'forces of attraction' between their particles. Which one of the following represents the correct arrangement?
Define 'melting point' of a substance ? What is the melting point of ice
Draw a labelled diagram of the experimental set-up to study the latent heat of fusion of ice.
How does a liquid changes into its gaseous state? Explain
Write whether the following statement is true or false:
A gas has no free surface.
The process by which a solid changes into a liquid is called
State which of the following statement is true or false. If false write the correct statement.
The conversion of water to ice is called freezing.
Give the reason for the following
Solids cannot be compressed, but gases are highly compressible.
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.
