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प्रश्न
A substance which can change its state
विकल्प
wood
oxygen
paper
cloth
उत्तर
oxygen
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संबंधित प्रश्न
Suggest a method to liquefy atmospheric gases.
The Kelvin temperature is 270 K. What is the corresponding Celsius scale temperature ?
Explain why, ice at 0° C is more effective in cooling than water at the same temperature.
Define 'boiling point' of a substance ? What is the boiling point of water ?
How does applying pressure (or compression) help in the liquefaction of a gas ?
Define the following terms: Fusion
Give two examples of the following:
Substances which sublime.
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.
Fill in the blanks with the correct word/s from the bracket.
Ice on absorption of heat converts to ‘X’ a process called ____ [vaporization / melting]. ‘X’ changes to water vapour on ____ [heating / cooling]. Water vapour changes back to ‘X’ on ____ [freezing / condensation]. The constant temperature at which ice changes into ‘X’ is called its ____ [fusion point / melting point / boiling point].
Halima picks up a small stone from the ground and puts it in the water in a dish. Does the shape of the stone change?
