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प्रश्न
Explain the terms boiling point.
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उत्तर
The temperature at which a liquid starts changing into vapors or gas at a constant temperature is called its boiling point.
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संबंधित प्रश्न
Differentiate between melting point and boiling point, giving atleast one example of each.
State the boiling point of water.
A certain quantity of water is heated from 20°C to 100°C. Its temperature is recorded after each 1 minute. The observations are:
| Time (in minute) | Temperature (in °C) |
| 0 | 20 |
| 1 | 30 |
| 2 | 40 |
| 3 | 50 |
| 4 | 60 |
| 5 | 70 |
| 6 | 80 |
| 7 | 90 |
| 8 | 100 |
| 9 | 100 |
| 10 | 100 |
| 11 | 100 |
| 12 | 100 |
How is the boiling point of water affected when some salt is added to it?
A pressure cooker is based on the principle that boiling point of water increases with the ______.
Assertion: The process of conversion of liquid water to its vapours by heating the liquid is called boiling.
Reason: The process of conversion of water vapours to liquid by cooling the vapours is called condensation.
Water into steam on heating is called freezing.
Choose the correct statement of the following
A sample of water under study was found to boil at 102°C at normal temperature and pressure. Is the water pure? Will this water freeze at 0°C? Comment.
Evaporation of a liquid at room temperature leads to a ____________ effect.
____________ is the change of solid state directly to vapour state without going through the ____________ state.
The phenomenon of change of a liquid into the gaseous state at any temperature below its boiling point is called ____________.
Alka was making tea in a kettle. Suddenly she felt intense heat from the puff of steam gushing out of the spout of the kettle. She wondered whether the temperature of the steam was higher than that of the water boiling in the kettle. Comment.
Conversion of solid to vapour is called sublimation. Name the term used to denote the conversion of vapour to solid.
Why does the temperature of a substance remain constant during its melting point or boiling point?
We would have observed that the plate that covers the cooked food items has water droplets inside. Why? Explain.
Assertion (A): No-new substance is formed when water is heated to get steam.
Reason (R): Conversion of water into steam is a physical change.
