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प्रश्न
Define the following terms: Melting point
उत्तर
The fixed temperature at which a solid changes into a liquid at a given pressure is called its melting point. The temperature remains constant as long as the conversion is going on.
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संबंधित प्रश्न
Fill in the following blank with suitable words :
Scientists say that there are actually five states of matter : solid, liquid, gas, .................... and ...................
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Substances which sublime.
A substance which can change its state
Explain the term freezing
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.
Complete the statement by filling the blank with the correct word given below.
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Complete the blank with reference to interconversion of matter on the basis of kinetic theory-with the word ‘increase’, ‘decreases’, ‘gain’, ‘lose’, or ‘overcome’ in the following case.
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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.
